I also use Quest 3 and VDXR and use the following start sequence:
- start VD streamer on PC (if not running)
 - start VD in Quest 3
 - start MSFS from VD Windows screen in Quest 3
 - click or key CTRL+ALT+V as shown for VR switch at MSFS screen bottom
 
I also use Quest 3 and VDXR and use the following start sequence: