Use of shortcuts in Firefox v151 on Windows 10

Hello, In my prior versions of the Firefox browser for Windows 10, I saved and used 1 row of shortcuts right under the search field of the browser. When I updated to v151, the same saved shortcuts keep overwriting with recently viewed pages, just like the history list. Is there a way to stop the browser from overwriting my saved shortcuts row? Presently, I have to manually delete every single overwritten shortcut to maintain a clean list of saved shortcuts after having browsed to other websites; this cleanup process is getting old! FYI, I do used the bookmark toolbar also, but there just a few saved shortcuts that I like to have and frequently use in the single row of shortcuts. Please advise how to save my succinct row of desired shortcuts if that's now possible to do. Thank you.