Flight modes and SBUS

I have a x8r on SBUS to my Pixhawk Cube. In mission planner I can’t set my flight modes as the are looking for a PWM value. Is there a way around this or do I need a PWM encoder?

You don’t need a way around it just set them. The PWM values are encoded in the Sbus protocol.

Is there somewhere I can read up on this? I couldn’t find any info
I did notice when cycling my mode switch in mission planner I got different flight modes come up. How can I choose which ones I want?
I also set up channel 7 to be an auto tune switch but I don’t believe it is set. If I activate the switch I get no buzzer response. I have set ch7 as auto tune in Mission planner