You can control the application entry points through Android Player Settings. For development builds, you can use multiple application entry points to quickly compare functionality and performance between them. For release builds that you intend to publish, you must only select one application entry point. If you select more than one, Unity displays a warning message.

To set which application entry points to use for your application:

If you select more than one application entry point and then build or export your application, Unity generates multiple entries in the Android App Manifest, one per application entry point.

If you open the project in Android Studio, you can specify which application entry point you want to run/debug in the Run/Debug Configurations dialog. Installing the built application on a device creates one icon per application entry point.