Ziggy

Looks like it's all for a timer and animated counter. You can always copy it, back it up, and then remove it to see what happens, if it's necessary code you can always replace it.

You can make it more difficult, but there is no way of preventing someone copying your content if you make it publically accessible, if you can see it you can copy it. Have a read of this thread which offers some methods to make it a little more difficult:

It does. Look in Image Effects the editing the section background.
 

Where did you get the code? 
Add this to the lock page code injection:
<style> *:focus { outline: none !important; } </style>  

Nope, but there are countless QR generators online that you can use should you wish.

Follow this to improve the design:
 
Or add this to Custom CSS to hide the slideshow on mobile:
@media only screen and (max-width:767px) { section[data-section-id="661565bbb54e6854c3a04ba2"] { display:none; } }  

Haha, that's not right!
Try this:
#collection-655b50b045a13147527cba9b { section[data-section-id="6614f78973b88f33805c6976"] { :not(.has-background) .section-background { background-color: #e1dfd9 !important; } } }  

Try this in Custom CSS:
section[data-section-id="6616a7ba048a76656b6e95a7"] { position : -webkit-sticky !important; position : sticky !important; top : 0px !important; z-index : 99999; } Let me know if that works.

Add this to Custom CSS
html { scroll-behavior: smooth; }  

Might be a silly question, but does this work if you put it in a code block on the page rather than in the header code injection?

Instead of using a RETURN (adding a paragraph break) try SHIFT + RETURN to add a line break.

Try adding this inside the last curly bracket:
.products.collection-content-wrapper .grid-meta-wrapper { border-top: 1px solid #000; padding: 12px 16px; }  

The website is Squarespace, but the popup is not, they are using Unbounce for that:
https://unbounce.com/product/popups-and-sticky-bars/
There isn't a way to add more fields in the Squarespace popup hence utilising this system, but there are many other 3rd party systems you could use.

This should work:
.header-menu-nav-item:nth-child(2) { display : none; }  

Have you followed all of these steps?
https://support.corepractice.com.au/hc/en-us/articles/115005453608-How-to-embed-our-Online-Bookings-on-your-site
Including "whitelisting" your domain? (Squarespace and custom domain?)
https://support.corepractice.com.au/hc/en-us/articles/4412936827407

This plugin does what you're asking for:
https://www.will-myers.com/products/p/sliding-image-banner

Well this should work if the none didn't:
.sqs-gallery-block-slideshow { background-color: rgba(0, 0, 0, 0); }

Try adding this to Custom CSS:
@media screen and (max-width: 767px) { .portfolio-grid-basic { display: grid; grid-template-columns: 1fr 1fr !important; grid-column-gap: 24px; grid-row-gap: 16px; grid-auto-rows: min-content; } }  

Try this in Custom CSS, adjust the value to your liking:
@media screen and (max-width: 767px) { .tweak-products-width-full .products.collection-content-wrapper { padding-top: 6vw; } }  

Try this Custom CSS:
h1, h2, h3, h4 { -webkit-hyphens: manual !important; -moz-hyphens: manual !important; -ms-hyphens: manual !important; hyphens: manual !important; }

Can you share your website URL?
From the screenshot it looks simply like you have two overlapping text blocks for the heading and body, and when the heading breaks to two lines that text then overlaps. Either put all of the text in one block, or make the heading block smaller so the block isn't overlapping the block below it.

Line 60 has a closing bracket, but I can't see a corresponding opening bracket.
 

You could try this Custom CSS:
.header-width-inset .header-inner { max-width: 1200px; }  

You need to set a max width of 100% in the iframe properties.

I've removed the unnecessary opening curly bracket for you here:
/* hide image titles slideshow hover */ .sqs-lightbox-meta { display: none; } .fancyborder { border: 4px solid #F2CBCB; padding: 10px; } #block-62d7c0af4dc1981f91f16f5c p, #block-62d7c0af4dc1981f91f16f5c h1, #block-62d7c0af4dc1981f91f16f5c h2, #block-62d7c0af4dc1981f91f16f5c h3, #block-62d7c0af4dc1981f91f16f5c h4 { color: #ffffff !important; } @font-face { font-family: ‘Faberge’; src: url(https://static1.squarespace.com/static/5e4a73e9773e7329ddf8b009/t/65f52f996ef2c801f0b61488/1710567322084/Faberge-Regular.otf); } h1 { font-family:'Faberge'; } p, h1, h2, h3 { -webkit-hyphens: manual !important; -moz-hyphens: manual !important; -ms-hyphens: manual !important; hyphens: manual !important; }