Move bookmarks menu to the left vertical side of the sceen Firefox

Hi, you probably are familiar with the Bookmarks Sidebar (Ctrl+B to open and close). Do you want to move the sidebar? There is a setting for that. See: [[Use the sidebar to access tools and vertical tabs]] - first section is "Move the sidebar to the left or right". If you meant the Bookmarks menu that you can open from the optional top menu bar (Alt+B), there is an optional toolbar button for that - it looks like a star sitting on a tray(<img src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2021-06-19-21-15-40-ba2c56.png">). You can add that to a convenient spot on a toolbar using the Customize panel ([[Customize Firefox controls, buttons and toolbars]]). Success? Or did I totally misunderstand what you need?