How to Reset Android’s Application Launcher to the Default in Android 7.x Nougat
Step 1. Go to the Settings menu.
Step 2. Pull the notifications shade twice.
Step 3. Tap the cog icon.
Step 4. Navigate down to “Apps,” then hit the cog icon in that menu.
Step 5. Tap “Home app”.
Step 6. Change your launcher, and you’re finished.