You cannot edit the realm world settings in split screen view. The settings GUI will appear, display an error, immediately return to pause menu, than back to settings to start the loop again.
Observed Result:
GUI goes into an endless loop when trying to edit realm settings in split screen view.
Expected Result:
Settings open like normal and the player can change what they want to change.
Steps to Reproduce:

1. Load into a realm you don't own
2. Have the realm owner join using split screen
3. Have the realm owner pause and open settings, screen should be in an error loop.
   Video Evidence:
   Xbox Video Clip
   Additional Notes:

• I've not tested where the owner is Player 1 and only as Player 2 or 3. So I don't know if this issue persists in that case.
• You'll also see another bug in the clip provided where the owner's skin didn't load. However, that is a separate ticket.