In UDisc, a layout's par should always match what is listed on the tee signs. This is explained in the best practices for UDisc's course directory.

If you are a player who prefers to play all holes as par 3, there is an option to allow this. Simply tap More and scroll down to the Settings, then disable the Use Course Pars option. From now on, any scorecard you create will only display par 3s. You can still manually change the par on any hole by tapping the par indicator for that hole. UDisc will also remember your custom pars the next time you pay the course.