Command Line Arguments

Game Specific

• -vr force enables VR
• -novr force disables VR
• -anyvr stop forcing SteamVR as the OpenXR runtime
• -noinitvr (unreleased branch as of writing) disables the game's custom VR initialization system (mainly added for debugging)

Engine Specific

• -force-d3d11 the game will render using Direct3D/DirectX 11
• -force-vulkan the game will render using Vulkan
• -monitor X the game will render on monitor X
• -screen-fullscreen X replace X with 1 for fullscreen and 0 for windowed
• -screen-width X replace X with the width
• -screen-height X replace X with the height
• -screen-quality X replace X with one of the following
• • VeryLow
• • Low
• • Medium
• • High
• • VeryHigh
• • Ultra

For more Engine Specific commands that might work, see Unity's Official Documentation