As the title says. I like the fact that I can completely hide the sidebar, but that also means that I don't really click on the tabs anymore, I use keyboard shortcuts to create new tabs, navigate between tabs, and close tabs.
However, in the event that I want to actually see my tabs in the sidebar, I am forced to move my cursor to the sidebar button on the top left, which like breaks my flow.
Thus, in my opinion, having a shortcut for showing/hiding the vertical tabs when the "Show and hide sidebar" option is selected could be really useful here.