If it is posssible, I too would really appreciate this as a new feature. If it is not possible, then perhaps you could do something like the tab button does in Adobe illustrator. When you press the tab key, it hides or shows the panels and thus allows you to see a lot more of your workspace.
Out of curiosity, would this be possible on the desktop app? Or is this something which is not possible since Gravit at heart is still a web based application?