This is an experimental feature to allow games running OpenXR to work with the First Person Stabilizer. Keep in mind this is experimental, feel free to leave feedback (open a support ticket or leave feedback over in the LIV Discord (https://discord.gg/liv)) on which OpenXR games this is working for and which it is not.
1) After launching the LIV desktop app, select First Person Stabilizer
2) Check the box "Enable experimental OpenXR Stabilizer" prior to launching the game.