As the title says, the option to show icons only for favourites (bookmarks) that are revealed by clicking the arrow in the far right of the favourites bar isn't working, only for those that are visible. This is a relatively old issue that hasn't been fixed yet, even on Canary builds.
@HotCakeX Actually, favourite syncing functionality as whole is broken at the moment, don't even bother with it.
@Bruce Roberts But what's the problem with wanting to see only the icons of the additional favourites in the vertical list? Even if I didn't mind, I'm reporting a feature that is partially broken and that should be fixed then.