How to hide generated dart files in Android Studio

In Settings panel, open Editor section, and select File Types. Now look for Ignore files and folders field at the bottom. Just include *.g.dart there and you're good to go!

In Project panel, under Options there is a File Nesting Option. I added .chopper.dart; .freezed.dart; .g.dart to .dart parent. This will group related files under the main file.