Add menu to full screen mode

[Neriderc]

In my workflow it is my first action in most cases to switch to fullscreen mode. Could there be an option to display the diagram immediately in full screen as soon as it is updated?
Then it would be fine to have another option in the pop-up-menu to get the side menu directly from fullscreen mode without having to finish fullscreen mode by clicking "x".
Having that would allow to do most of the work in fullscreen mode which should be especially helpful on tablets or even mobiles.

Originally posted by @schuco in #402 (comment)