I don’t see any option for that
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Wonder if copying the LibOVRRT32_1.dll and LibOVRRT64_1.dll into the directory where the exe is would work?
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I would like to do this also for Dirtrally 2, but I don’t know how to do it
@park has made a quite few steam games run in oculus mode. Or the opposite. 
https://community.openmr.ai/t/how-to-play-dirt-rally-vr-on-pimax-8k-5k-without-revive-and-steamvr/18578
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Launch SteamVR from the desktop click on drop down of Game launcher.
Everspace for example has option to launch in
- SteamVR
- Oculus
- NoVR
If not see @park’s various tutorials.
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I assume you mean the pitool game launcher has a drop down menu?
No. You’re asked in Steam (desktop) when You click play.
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