For Windows 11, the supported way to stop Do not disturb is:
- Open Start > Settings > System > Notifications.
- Turn off the Do not disturb toggle.
- Expand Turn on do not disturb automatically.
- Turn off every automatic condition:
- During certain time of the day
- When duplicating the display
- When playing a game
- When using an app in full-screen mode
- For the first hour after a Windows feature update
If notifications are still being suppressed, verify that Do not disturb is not currently enabled from the notification center:
- Open the notification center.
- Select the bell icon with zZ to turn it off.
If the setting appears stuck or grayed out, policy may be enforcing Quiet Hours behavior. The documented policy controls are user-scoped ADMX-backed policies under Start Menu and Taskbar > Notifications, including:
- Turn off calls during Quiet Hours
- Set the time Quiet Hours begins each day
- Set the time Quiet Hours ends each day
Those policies can prevent users from customizing Quiet Hours settings.
For Windows 10, Local Group Policy Editor exposes Set the time Quiet Hours begins each day and Set the time Quiet Hours ends each day under User Configuration > Administrative Templates > Start Menu and Taskbar > Notifications. To verify applied policy, run from an elevated command prompt:
gpresult /h C:\temp\output.html
Then open the report and look for policies containing Quiet Hours.
The provided documentation does not describe a supported method to permanently remove or hard-disable the Windows 11 Do not disturb feature beyond turning it off and disabling its automatic triggers.