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MCXR Play is currently the only way to play Minecraft in VR on Fabric.
Thanks to Sodium and Iris it is also the most performant Minecraft VR mod (on the majority of systems) and it is designed to be as minimally invasive as possible to maintain compatibility with other Fabric mods.
MCXR and the OpenXR ecosystem are still fairly young so there are a few rough spots that need working out.
Default Controls
Warning: Due to issues with LWJGL's default allocator it is recommended you always install Sodium alongside MCXR Play, even if you don't want it for some reason

Minecraft VR!