I would like to suggest number of things for layout. When I go to the layout and click in the detail and press the “Swap hidden and visible objects” all Details on layout will disappear instead of just the current 3D view in the Detail. Also when I press “Swap hidden and visible objects” in model view and switch back to layout view again the whole layout is empty. I think it would be better to handle Layout and Model view separately.
It is also difficult to select object what to unhide in details. We can hide them all easily, but when we want to unhide only one object it does not work, and all previously hidden object will be visible even without pre-selection to give the possibility to group them temporarily while we make some adjustments.