(macOS 15.7 on macbook pro).
As indicated in this session, many people find the MacOS 15.7/safari bookmarks sidebar to be just dreadful, with its "huge" icons and unnecessary text. It makes finding the correct bookmark a painful operation, especially because I have lots of bookmarks. The only FIX I can find is to switch to chrome, where I can at least get the simple bookmark list in one window on screen.
To export bookmarks on macOS 15.7, you go to safari->file->export browsing data to file, and select from the resulting popup. You get a zip file which you can unzip with the apple accessory.
To get bookmarks into chrome, click on the three vertical dots on the top right of chrome window, select "bookmarks and lists", then "import bookmarks and settings".
Unfortunately, these bookmarks do not appear in the chrome bookmarks sidebar. (If anyone knows how to do this, I would appreciate it.) You must click on "imported" in upper left of chrome window. Still, for me, this is much much better, as I just get an undecorated list of names.
You canned a new bookmark to this list. (This is long snuff already.)
When apple decides to quit being so "cute", and to stop doing unsolicited favors, I will return to safari (maybe - I might get to like chrome).