Personally, I do not use the sidebar, but I know that many simply cannot live without it. Undoubtedly, this is a very convenient thing, but the pursuit of perfection is an endless thing, so I suggest you try out the following tricks to remove a couple of restrictions.
In order to use them, you will need to edit the userChrome.css file (which is usually located in the chrome folder in the profile folder; if you do not have it there, then go to the chrome folder and edit userChrome-example.css, renaming it to userChrome .css ), adding the following lines to its end: