Custom DPI not working on Volkswagen

Hi, I have a Volskwagen Arteon with Media Discover Pro (9.2"), I have tried to activate the widescreen by changing the DPI value. I have tried 100, 110, 120… but with any custom value I enter the AA does not start (shows a message that I must continue on the mobile and does nothing else). However as soon as I set the default DPI everything works but no widescreen.

I have the last firmware in Carsify (1.10).

Can you help me?