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Your deviceOPPO A3x
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Open Settings

Open Settings and use the search box to search for Do Not Disturb.

Manufacturer UI recreationOPPO A3x · OPPO ColorOS
9:41
OPPO ColorOSSettings
Search settings
Search settings
Sound & vibration
Notifications
A recreated OPPO ColorOS screen for OPPO A3x, matched to the menu path documented by OPPO Support. It is not a screenshot. The highlighted control is added by UKTechExpert, and a software update may move it slightly.