Exempting App in Galaxy S7 Power Manager
Open your Android Settings and click on the "Device maintenance" menu
Tap the "Battery" button.
In the "Battery" menu you will need to scroll down to the bottom.
At the bottom of the "Battery" menu, select Unmonitored apps.
Tap the Add apps button.
Tap on SMS Tracker in the list and tap the DONE link in the top right corner.
Congratulations! You're all done.