I did this when I first started messing with Galaxy - I have a "Now Playing" tag/bookmark on the left right along with the names of the other platforms like Steam and Origin. Now that I'm adding more tags, though, I can't remember how to get them to list on the left hand sidebar like the bookmarks. Can anyone remind me?

Click on all game
Then filter with the appropriate tag
Then sage bookmark

Oh I see it. The bookmark button/icon is so tiny I didn't notice it. Thanks!

Thanks to this button, you can also add every link you find in "activity" section and "shop" section.

For instance, you can a "GOG profil" bookmark, or the "gog community" bookmark