The Organize Bookmarks menu button, which can be accessed by SHIFT+TAB from anywhere in the folder tree (2 times if your within a folder list itself) presents the following six items when you down arrow once you have focus on it:
Sort by name
Add new bookmark
Add new folder
When you are actually resting on any given folder or bookmark you can use cut (CTRL+X) to pick it up for moving and paste (CTRL+V) when you have focus on the folder in which you wish to place it or are in the items list for that folder. True drag and drop works, too, but I am not having much success with emulated drag and drop in this instance, and cut and paste works (which is a better way of moving a bookmark from place to place than my earlier recommendation to copy URL, delete existing, create new, and paste URL). Live and learn.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.
~ H.L. Mencken, AKA The Sage of Baltimore