HI John,
The remove bookmark option is available when you visit that bookmark (if I am not wrong).
So if you have Bookmarks A to J (10 nos) then the remove bookmark option would appear whenever you are on the A~J links and then you click on Bookmarks.
So if you have General Ledger report in your bookmark and you want to remove it then you would have to visit the link and then click on bookmark (voila there would be the remove bookmark button).