Is it possible to use Kotlin with an emulator? (not a flutter app)

Can I develop Kotlin by actually debugging in the emulator like in Flutter but this is not a Flutter app?

Yes you can, you need to customize nix file

Check this out

But yes, technically you can do it, but there aren’t any official kotlin support for VSCode, so you’ll have to rely on a third party plugin
(sadly, I don’t know if the plugin work well or not, so you’ll have to experiment with it)

How to change the screen size or DPI of the emulator?

Displaying more emulator settings is something we have planned for a future release!