Hello there @Miriam5432! Let’s see what we can do here.
Investigating around the community, the most common solution for flickering/weird widgets in VR is to set them to a stereo layer, which can be done following these tutorials:
https://dev.epicgames.com/documentation/en-us/unreal-engine/openxr-stero-layers-overview-in-unreal-engine?application_version=5.1
https://dev.epicgames.com/documentation/en-us/unreal-engine/openxr-stereo-layers-quick-start-in-unreal-engine?application_version=5.1
A related thread encountered alternative paths to resolution, please check them here:
