There are two ways to the restore the default layout: (1) On Startup, and (2) In the Options Menu.
Press the Shift key while you open Rapise. Keep the Shift key down until Rapise is done initializing.
In Rapise, select the Options Ribbon:
The Options Ribbon will appear. Click on the Reset Layout button under the General tab.
Rapise will restart and the layout will be returned to the default.