I appreciate that the negative space is that amount specifically so it can fit the "Show more" option's fields, but given how they're, well, not displayed by default, whereas the folders are... feels a little odd to not make use of that space in what is presumably the majority of cases (otherwise "Show less" would be the default, right?)
If it's just switching between the two sizes for the folder view, that doesn't feel too taxing. One view that truncates would probably be better still, so there's no need for scrolling the entire screen - which clearly would be bad UX.
You need to describe for us what exactly the raindrop service does, and how it is different from vivaldi.
Also, raindrop has an extension, so why not just use the extension?
@LonM Hmm, that could work (I have tried it with some bookmarks previously), but I guess there's the problem that my subconscious still defaults to "slides" and "docs" whenever searching for the respective bookmarks.
Good suggestion, though.