Does the Stratus have a setting for pressurized aircraft?

Yes, within ForeFlight go to MORE > DEVICES and tap on the Stratus tile. Scroll down towards the bottom and look for a switch called CABIN IS PRESSURIZED. Turn that on if you fly an aircraft with a pressurized cabin. 

Cabin_is_Pressurized_switch.png

Image 1. Cabin is Pressurized switch in Stratus settings.