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You need to give more information.
How did it happen?
Was is showing full screen before ?
Did you change any settings on Android screen settings or idrive settings?
So that others can think of the possible causes.
I will suggest doing the followings.
Performing factory reset on the android screen.
In the factory settings. You can change the screen resolution one after another to see if it comes back to full screen.
Another thing is you can use Bimmercode in expert mode
HU NBT 3005 display_pip_config
Change CID_Display_res
Change CID_Display_size
You will have to change one at a time and see if the display comes back to normal.
When using Bimmercode try to choose your android screen resolution and 10.5 for the display size. You won't find 12.3 inch in display size.
Those are the things I will check first.
Good luck.
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