Many times when on a screen, users want to open a new screen. To do so, you left click on menu, find the item you want and either Ctrl Left Click or right click open in new tab. This works great. However when returning back to the original tab the menu is still open and occupying most of the entire screen. Closing it is not always intuitive to the user. X or click in the small right margin.
It would be convenient if when opening a new tab the menu closed so that when looking for the original tab you could see the screen (not the menu) and so that it isn't necessary to close the menu.