The exact button you use to open the in-app menu will depend on which headset and controller you're using.
Oculus with SteamVR: Y button / B button
Valve Index: B button on either controller
Vive or Windows Mixed Reality: "hamburger" menu button
The exact button you use to open the in-app menu will depend on which headset and controller you're using.
Oculus with SteamVR: Y button / B button
Valve Index: B button on either controller
Vive or Windows Mixed Reality: "hamburger" menu button