Hello! We see you say you're seeing a red dot on the screen of Meta Quest 2 and are concerned about why it's there, we understand you want to handle this, so have no fear, Meta is here to help.
The red dot in the upper right corner indicates that the device is casting or video recording. To disable those settings, follow the steps below:
These steps should resolve your problem while also informing you that you are casting or video recording on the device. Please let us know if this helps so we can look into this further for you.