rodvaldr

There is currently an issue. See status.squarespace.com
 

 

The general structure is that inside a gallery object, you get specific wrappers depending on the grid type (e.g. masonry, basic etc), that eventually finds a "figure" with a link (if you've got the lightbox enabled), and inside that the image.

so you could use an nth-child selector (e.g. pick me the 5th picture in the gallery) but you'd have to remember that if the order of the pictures in the gallery changed then it would select a different picture.
for example, this would put a border around the second child in every gallery. prefix it with the relevant data section if you just want it on one page (or inject it into that specific page)
.gallery figure:nth-child(2) img { border:solid 1px red !important; } If you wanted to be more specific you could also use an attribute selector based on the itemId (which you can see in the URL if you use a lightbox, or you can find in the source), or some other image source attribute if you're not using a lightbox.
// for a lightbox-enabled you can target the link // $= means ends with. you can find the itemId in the url when you open the image // in the lightbox .gallery a[href$='eh93bxzp9wth135k95a1y8qkpopbv7'] img { border:solid 1px red !important; } // non-lightbox version, you can find the image by searching // its attributes for the filename (you could do this for lightbox ones too // but the itemId is easier to find!). you can use data-src, or src or data-image .gallery img[data-src$='20140301_Trade-151_0124-copy.jpg'] { border:solid 1px red !important; } hope that helps
 
 

This is the result of the Block Editor UI update that was rolled out without warning on 3rd February 2021. Prior to this update, you could manually enter multiple tags separated by commas on anything other than Squarespace 7.1 Store content. Unfortunately, the new Block Editor has a dropdown control instead of a textbox and it is now only possible to select one category (or tag). 
Squarespace overcame many of the new UI limitations by issuing an update on 14 February, but this particular issue was not resolved in this update. I agree with @digitalfreelancer that this is extremely irritating and look forward to this being fixed in the near future. You can voice your concerns to the Product team by logging a ticket here.
For information, the Summary Block Editor UI is shown below, before and after the update (Feb 2021):
 
See the update. The ability to add multiple tags was restored.

Thank you @tuanphan ! You're a true hero on this forum 🙂 

In 7.1, if you click on a tag or author name, you basically see the exact same page as the parent collection page but with the filtered results. Unlike 7.0, there is no visual indicator (i.e. text) to tell you what exactly changed and how your results were filtered.
Am I missing something or is there a way to display how exactly you filtered, such as with a "Filtered by tag XXX" in 7.1?