I remember reading that this game does not use SteamVR but the oculus SDK directly for rift users. Hence the Steamvr button not working. I could be wrong though
Okay so I tested this briefly and it does work. How to do it specifically:
Right-click on the “OrbusVR” item in your Games list on Steam, select Properties…
Click on the “Set Launch Options…” button
Type in “-vrmode openvr” in the box, save and close.
However, note that what this does is force the game to use SteamVR instead of the native Oculus SDK. This does give you access to the SteamVR overlay while you are in-game. However, keep in mind that:
You are now using SteamVR as a middleware layer in front of Oculus, so there is some overhead associated with that.
You are losing out on some Oculus-specific features, such as for example pressing the Grip button and pointing your finger no longer does the point gesture.
The angles of a few things will be different, such as the hands and the bow, because you’re using the SteamVR “rig” instead of the Oculus “rig”, where we adjusted those angles to better match the Touch controllers.
So yeah just letting you know what’s actually going on there. But if access to the SteamVR overlay is your top priority, those trade-offs may be worth it for you