For those who are still not able to find it, just follow the latest documentation here: https://developers.meta.com/horizon/documentation/unreal/unreal-keyboard-overlays/#enable-the-system-keyboard-with-a-project-setting
Navigate to Edit > Project Settings > Plugins > Meta XR and check Requires System Keyboard . This will add an entry (oculus.software.overlay_keyboard ) to the app manifest, telling the runtime to use a VR keyboard.