Robino

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update - just chatted with support and the agent said that anchor links are not supported in 7.1
It's strange, such a basic functionality.
If anyone know of a workaround please share, thx very much

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.

Update #2
Ok I got it working. This is how you add Smooth scrolling anchor links in Squarespace 7.1
This works in all browsers including mobile.
------------------------------------------------------------------------------------------------------------
1. Insert this code in the HEADER CODE INJECTION
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://unpkg.com/smoothscroll-polyfill/dist/smoothscroll.min.js"></script>
<script src="https://unpkg.com/smoothscroll-anchor-polyfill"></script>
2. Insert this code in CUSTOM CSS
html {
  --scroll-behavior: smooth;
  scroll-behavior: smooth;
}
3. Create your anchor links.
You will need to get the  PAGE SECTION ID for the section you would want to anchor to. It looks like this: #page-section-5e2799dfc3035b3cf9e9c4d6
I have a hard time finding those IDs so what I do is right-click and inspect the section I want to anchor to and I do a search in the console and type: ID. Then you should be able to easily find all the page IDs.
Once you have your page ID, you can create text links or buttons, whatever links you want and just put the # sign before the ID so it looks like this:  
#page-section-5e2799dfc3035b3cf9e9c4d6
That's it - smooth scrolling in all browsers and mobile. Note that in Chrome it will smooth scroll to a CODE BLOCK when using regular CODE block DIV IDs but it won't work in SAFARI / iPHONEs Mobile. Only the #page-sectionIDs work in all browsers.