Is there a minimum firmware for Android for one program or how to make one program always active?

Question

Android

Greetings!
I'm doing something like a control panel from a tablet.
Everything is ready, but there is only one thing left - to directly make only one active application.
That is, that there would be no desktop, no upper or lower menus, no extra services and other programs.
I deleted everything from the stock, but the menus and the desktop still remained ...
Are there any ready-made firmware for this case?

Answer 1

This application must have the CATEGORY_HOME intent filter in its manifest.