Plane Flight Modes on RC5?

I just bought a used Aero and I’m trying to set it up like my other Skywalkers. Strange thing is the Flight Modes are on RC5 like a copter rather than RC8. I’ve never seen this before, and I don’t know how to switch it back to 8. I don’t see an RC Function option to control this.
[attachment=0]ImageUploadedByTapatalk1439262301.518948.jpg[/attachment]

Nevermind, I found it.
FLTMODE_CH