Rearrange bookmarks

I am unable to rearrange or sort bookmarks that appear on the bookmark bar. I am able to do so with the bookmarks that are within “Hidden bookmarks”, but I cannot drag them onto the bookmark bar.
I can’t do rearranging even in the bookmark manager.

This happened after importing a lot of bookmarks from Google Chrome. When I had only a couple bookmarks, I could rearrange them.

Actually, I have the same issue in Google Chrome.

Solution: click on hamburger in upper right
Mouse over “Bookmarks”
The pop-out list of bookmarks is rearrangable.