Change your Do Not Disturb settings --- in IOS

 https://support.apple.com/en-us/HT204321#:~:text=or%20iPadOS%2014%3A-,Go%20to%20Settings%20%3E%20Do%20Not%20Disturb.,when%20the%20device%20is%20locked.

If you don't want to be disturbed at a certain time, you can set a schedule and change other Do Not Disturb features to help you concentrate. Here's how with iOS 15 and iPadOS 15:

 

1. Go to Settings > Focus. 
2. Tap Do Not Disturb.
3. Select settings for Allowed Notifications, Focus Status, Smart Activation, and more.

With iOS 14 or earlier, or iPadOS 14:

1. Go to Settings > Do Not Disturb.
2. Turn on Scheduled and set a schedule. 
3. Choose when you want to receive alerts, calls, and notifications:
   • Silence: Choose to silence calls and notifications always or only when the device is locked.