Didn't quite understand the text description, but knowing KM's great vertical-toolbar-on-arrow-click trick for the Main Menu bar, just tried the same now for the Bookmarks Bar and yep - works the same :-)
The trick is, as JH mentioned above, to just drag with the mouse the neighbor toolbar to the left COVERING the Main Menu Bar, or here the Bookmarks Toolbar, until only the flip-up arr
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