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Like there will be an option for a full screen mode in 6.0, there should be one to just hide/show all current activated toolbars -> a toggle toolbars visible option. Maybe there should be an option for the menubar too?
Regarding toolbars - it's duplicate of issue 38615 There is a Full Screen Mode - without menus and toolbars accessible through main menu View | Full Screen
*** This issue has been marked as a duplicate of 38615 ***