You can just drag 'n drop the boxes around.
Grab one box on the top, where the title is and then move it over another box and drop it.
Changing colors should should show what happens when you drag the box.
Dropping the box over another one will result in a bottom tab bar to toggle the boxes.
Do the same with the 3rd box.
To change the tab order, you can drag 'n drop the bottom tabs.
It is not much, but there is a short explanation in the manual:
investing less than half an hour into Search function can save hours or days of waiting for a solution