I create my book on a 1366 x 768 screen.
The horizontal scrollable are is -180mm to 180mm
The book is DIN-A5
When the horizontal scrollable area would be a little bit larger,
it would be possible to place the F2 properities box beside the 2 DIN-A5 pages.
When I could scroll 30mm more to the left or to the right, there would be enough place for the F2 box.