You can control the GA property linked to your app using Firebase.

Step 1 - Go to your Firebase console.

Step 2 - Access the Project linked to the app.

Step 3 - Click on project settings.

Step 4 - Click on Integrations

Step 5 - Under Google Analytics, Click on Manage

Step 6 - Click on three dots on the right and you can Unlink and link it again with the required property