SteamVR opens into a home environment when it first starts. I disabled UE4 from opening SteamVR by disabling the SteamVR plugin from within UE4 and telling SteamVR to not open with applications. SteamVR no longer opens, but the SteamVR home (“Steam tours” in processes) is still opened by UE4 along with the VR dashboard compositor and a couple of addons I have for SteamVR. Idk how to not make this happen. My HMD isn’t on but I can hear the birds through my speakers from the VR home. Opening UE4 also still sets my playback to my Vive.