Notifications keep you up-to-date about everything that’s happening in the game while you’re not playing.
Android
You can turn them on and off in Settings > General > Applications > Mystery manor. There you can check or uncheck the Show Notifications box.
iOS
You can turn them on and off in Settings > Notifications > Mystery Manor.
Windows
To turn off notification, open your PC settings, go to the Notifications & Actions tab, find Mystery Manor in the list, and move the slider to the OFF position.