In Settings at the top left.
Previews can include things like text (from Messages and Mail) and invitation details (from Calendar). You can override this setting for individual apps.
Tap an app below Notification Style, then turn Allow Notifications on or off.
If you turn on Allow Notifications, choose when you want the notifications delivered—immediately or in the scheduled notification summary—and turn Time Sensitive Notifications on or off.
For many apps, you can also set a notification banner style and turn sounds and badges on or off.
Tap Notification Grouping, then choose how you want the notifications grouped:
Automatic: The notifications from the app are grouped according to organizing criteria within the app, such as by topic or thread.
By App: All the notifications from the app are grouped together.
Off: Turn off grouping.
To turn off notifications selectively for apps, go to Settings > Notifications > Siri Suggestions, then turn off any app.
When you use Focus, it delays the delivery of notifications on iPad to prevent interruptions. You can schedule a time to receive a summary of the notifications you missed. See Allow or silence notifications for a Focus on iPad