You could also try the plugin I created: VR Spectator Control Window plugin example - YouTube
It will create an extra window for you next to the Spectator screen, where you can make your UMG and interact with it.
You could also try the plugin I created: VR Spectator Control Window plugin example - YouTube
It will create an extra window for you next to the Spectator screen, where you can make your UMG and interact with it.