Using a pre-made default schedule is a quick way to apply the most commonly used schedules. The default schedules don't require any setup and can be found in the Schedule dropdown bar. 

Network | Thread | Power Scheduler Editor

Each default schedule will come with different pre-configured schedule rows (Wake Duration, Repeat, and Time settings). The default schedules cannot be edited, but you can quickly clone the schedule and edit it to your desired preferences.

Select a default schedule to view its different settings.

Network | Thread | Power Scheduler Editor | Low Power Schedule