So let start
How To Recover Removed Notifications On Android Devices
Firstly, you have to unlock your developer options. Just go to SETTINGS then tap on ABOUT PHONE and scroll down, then tap on BUILD NUMBER seven times and you would become a developer (go back to SETTINGS and you will see a developer added to your settings menu list). If you are a developer before, just follow me.
STEP 1: Just long-tap on empty space on your Android home screen and tap on WIDGETS.
STEP 2: Now, scroll down to SETTINGS SHORTCUT Widget and drag the widget to your home screen.
STEP 3: In the settings shortcut, scroll down and select NOTIFICATION LOGS.
STEP 4: You can now go back and tap on the SETTINGS SHORTCUT Widget and all your notifications history will appear to you.