I wanted to submit the following feature request.
It would be most helpful to have options for the toolbar, menu bar, formatting bar, etc. that you could check to show/hide, depending on your Mode.
It would be nice to be able to hide all in Browse Mode, but when you go into layout mode, have whatever was checked (toolbar, menu bar, formatting bar) appear.
Currently I make use of a script that toggles these bars, but have to run it before I go into Layout Mode, then run it again when I'm back in Browse Mode.