Oppo
Turn Do Not Disturb On or Off auf Oppo
Do Not Disturb on Oppo phones running ColorOS mutes ringtones, notification sounds and vibration in one step. It is controlled from the same screen as your general sound settings, not from a separate quick toggle menu, which is why many users struggle to find it again after turning it off once.
The mode is useful when you need guaranteed silence, for example during meetings or at night, but it can also hide incoming calls and messages completely unless you configure exceptions. If you only want to mute a single app or contact instead of the whole phone, per-app notification settings are usually a better fix than the global Do Not Disturb switch.
Where to enable or disable it
Open Settings, then tap Sound & vibration. Inside this screen you find the option to enable or disable Do Not Disturb directly.
Turning it back off restores all sounds and vibrations immediately, including any calls or notifications that were hidden while it was active. If notifications still do not appear as expected after switching it off, check whether a schedule or an app-specific mute is overriding the setting.