Optimized the APK

The dev console show the following warning:

Unoptimized APK
Warning:

This APK results in unused code and resources being sent to users. Your app could be smaller if you used the Android App Bundle. By not optimizing your app for device configurations, your app is larger to download and install on users' devices than it needs to be. Larger apps see lower install success rates and take up storage on users' devices.

Resolution:

Use the Android App Bundle to automatically optimize for device configurations, or manage it yourself with multiple APKs.

The application is not very big right now but smaller is always better.