Is there a button? I recently became affiliate but haven’t seen one, there is just controls for setting the intervals and the amount of time, with more perks as you increase the timeslots.
I roughly remember that there was one for a time which allowed you to somewhat shift the scheduled hourly ads, but I think they might have removed it after testing. Through I think it also never worked really well either.
Manually running enough ads should also stop the auto scheduler from running ads and disable prerolls too