Send a screenshot so we can see your browser, but you can try this. see screenshot

You only get a sub menu if you have set <b>browser.toolbars.bookmarks.2h2020 = true</b>. These new features under this pref are still under development, so use at your own risk. ---- Make sure toolbars like the "Bookmarks Toolbar" are visible. Open the Customize window and set what toolbars (Show/Hide Toolbars) and toolbar items to display. *Right-click empty toolbar area -> Customize *"3-bar" menu button -> Customize *View -> Toolbars<br>*you can tap the Alt key or press the F10 key to show the hidden Menu Bar temporarily *check that "Bookmarks Toolbar Items" is on the Bookmarks Toolbar *if "Bookmarks Toolbar Items" is not on the Bookmarks Toolbar then drag it back from the Customize palette to the Customize window to the Bookmarks Toolbar *if missing items are in the Customize palette then drag them back from the Customize window to the toolbar *if you do not see an item on a toolbar and in the Customize palette then click the <u>Restore Defaults</u> button in the Customize palette window to restore the default toolbar set. ---- *https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars