Apple – Support – Discussions – How to sort bookmarks alfabetically? ….  andyBall_uk suggestion worked for the poster.

Hi Sverker

Does it even exist?

not built-in, click a button or set a preference, no…

but if you select all the bookmarks in a folder, drag them out to a Folder on the desktop you created (with sort by name enabled, which is the usual default) – you can drag them back in again, duly sorted alphabetically, trashing the un-sorted ones right after.