Thank you. For custom background, you can do that using custom CSS settings. E.g. paste this bit: "body { background: url(https://picsum.photos/2000/1400) center no-repeat; }" and see what happens.
More on customization here: https://github.com/perfect-things/perfect-home/blob/master/customization-tutorial.md

Thank you. That's very kind :-)

Hi, thanks for your comment. If a browser-restart doesn't help, would you mind creating an issue on github.com/perfect-things/perfect-home/issues, or sending an email to the provided support email address?

Hi, happy that you like it. You can either set the max grid width in "Customize" section to be a multiplier of your desired no of columns (so there would be fewer columns on smaller screens) or set the fixed number (e.g. to 8) in css: main.bookmarks { grid-template-columns: repeat(8, minmax(var(--icon-width),1fr)); }

Thank you for the review. Yes I changed the text that shows up on "text thumbnails" in the last version. Before it was a combination of domain/subdomain, now it's the title of the bookmark. The reason was that on ad-hoc bookmarks that I sometimes add it was difficult to say which link was which. E.g. if you create bookmarks to let's say 2 of your emails in gmail - before the change - the thumbs would look exactly the same. Now they should contain the title (so the title of the emails) so they should be different.
There is, however, some room for improvement - like you mentioned - cropping the text that appears on a thumb should be helpful, as very long titles do look weird. That is something that will be fixed soon.