Here's how to check 'Do not disturb' settings if your Galaxy Tab A7 Lite isn't receiving alerts for texts and email.
Do either of the following:
To activate / deactivate immediately, tap the
Do not disturb switch
to turn on or off.
To manage a 'Do not disturb' schedule, tap the switch to the right of the preferred schedule(s) to turn on or off.
Tap the
Back icon

to return to the previous screen.
Calls, messages, and conversations
Alarms and sounds
Apps
Tap the
Back icon
to return to the previous screen.
Tap
Hide notifications
then tap a notification setting (e.g., Hide all, Hide full screen notification, Hide app icon badges, etc.) to turn on or off.