Here's how you can change notification settings for each application in Windows 8.1.
1. Go to the start screen.
2. Open the Charms Bar.
3. Go to Settings.
4. Go to Change PC Settings.
5. Go to Search & Apps.
6. You'll see a list of applications.
7. Toggle the switch to turn notifications on or off.
8. You can also set up Quiet Hours.
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