Valve Index - Elite Dangerous and steam overlay query

[kration]

I've been having a few struggles with my Valve Index. For various reasons I've been using it intermittently since I got it, but the software seems really awkward to use.

I've finally figured out how to wake the headset, without unplugging cables etc.

I mainly use it for Elite Dangerous, but when I boot up the game the Steam VR Library (?) overlays everything else and blocks me from interacting with the Elite Dangerous menu. How do I switch it off and stop it from appearing?

I feel this should be obvious, but I've been searching settings etc. and nothing seems to work.

 

[kration]

I don’t have an Index but can the shift-tab action deal with this?

I've tried that, but the only 'window' to close shuts down the whole of Steam VR, and therefore no VR.

I think I'm being such a noob on this. I'm really impressed with the Valve Index hardware (with some reservations), but the software is so frustrating it's stopping me from enjoying it.