I use the rightmost toggle switch - T5/T6 - for hud mode switching and the FSS. Downward press for the mode switch, lift it to go into FSS mode. It's easy to hit "by feel" as I take my hand off the stick to move over to my trackball to control the scanner. My left hand stays on the throttle because I use the larger rotary on top as an absolute tuning axis. I don't use a VR headset myself but unless I've moved the trackball somewhere stupid I never need to look to see what I'm doing.