Emulator Phone Size

Hello to all...
in the main screen of AppInevntor i can choose between Handy, Table or Monitor Size.
Unfortunatly the Phone Size allows only 505*320 pixel. is there any possibilty to change the phone size pixels? if not, I will have different layou out in AppInventor and in reality.

Hope there is a solution

Best greetings and have a nice weekend
Michael

For that, you must tinker with App Inventor's source code.