You can recreate all the part layouts that Dorico Pro provides by default; for example, if you accidentally deleted some part layouts.
Procedure
In Setup mode, choose .
Result
The default set of part layouts is restored, recreating a single part layout for each player that contains all flows in the project. Any part layouts that were recreated are added at the bottom of the Layouts list. Their order matches the order of the corresponding players in the Players panel.