Autostart probably the best MIUI feature that doesn’t come enabled by default, but should.
What does autostart do? It basically starts the apps you select when the phone starts, so you never miss any notifications or updates.
To enable autostart for your apps, follow the steps below:
1. Tap on the Security app from the app screen.
You will not find this if you enter from the Settings menu, you have to tap directly on the app icon.
2. Once in the Security app, tap on Permissions.
3. Tap on Autostart
4. Toggle the apps you want to enable Autostart for
5. Reboot your phone.
Now you are all set up with autostart!