How do I get notification count on app icon?
Turn on App icon badges from Settings.
Navigate back to the main Settings screen, tap Notifications, and then tap Advanced settings. Tap the switch next to App icon badges to turn them on.
How do I not show notification number on app icon?
If your Samsung Galaxy smartphone runs Android 11 or 12, open the Settings app and head into the "Notifications" menu. Then, tap "Advanced settings" and toggle off the "App icon badges" switch.