... here we use switch H assigned to Aux2 (channel 7)
In the servo monitor you can see how the switch changes the output of gyro channel. +100% = AttitudeControl on
-100% = AttitudeControl off
If you like to inverse the switch direction just reverse the AttitudeControl channel in your transmitter
For the beginning reduce the output of the AttitudeControl channel to apprx. 50% in the direction where AttitudeControl is activated. This will set attitude gain to 50%.