Samsung Galaxy Note9 - Text Message Notification Settings
From a Home screen, swipe up or down from the center of the display to access the apps screen. These instructions only apply to Standard mode and the default Home screen layout.
Tap Messages.
If prompted to change the default SMS app, tap YES to confirm.
Tap the Menu icon (upper-right).
Tap Settings.
Tap Notifications.
Tap the ON switch to turn on or off . When on, configure the following:
Tap App icon badges to turn on or off. When on, a small dot appears on the app icon indicating there's a notification you may have missed.
From the Categories section, select any of the following:
General notifications
New messages
Select any of the following to configure: The available options may vary.
Importance Tap then select the desired option (e.g., Urgent, High, Medium, Low).
Sound Tap then select the desired option (e.g., Default, Silent, etc.).
Vibrate Tap to turn on or off.
Blink light Tap to turn on or off.
App icon badges Tap to turn on or off.
On lock screen Tap then select the desired option (e.g., Show content, Hide, Do not show).
Do not disturb custom exception Tap to turn on or off.