Testing out the VR preview with the Oculus Quest 1 on Unreal Engine 4.26
Below is the steps to access VR Mode and VR Preview with the Oculus Quest 1.
Enable Oculus VR and turn off Steam VR in Plugin Settings. Enable VR Mode Auto-Entry option in Editor Preference. Restart Unreal Engine.
Put your oculus headset on and enable oculus link in your headset