Aviate, communicate, navigate. Be the aircraft in the pattern that is situationally aware.
At a non-towered airport there is no controller to determine which runways are in use. There is no ATIS.
You have to determine which runway is the most suitable for landing. One, check the METAR, what are the winds doing. Two, where will you be parking, get a runway diagram of the airport open and plan out your exit and taxi to your parking spot. Three, most importantly, scan the traffic.
The runway colors in-app are guides, they are not gospel. It is up to you to make the decision, not a color predetermined by the computer.