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Take iphone13,ios16.4 as an example. This cooling mode is just a focus mode, it does not really play a role in cooling.
Open Settings and click Focus Mode.
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Click the + icon.
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Click Customize.
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Enter Cooling mode, select a snowflake pattern, and click Next.
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Click Custom Focus Mode.
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Then slide down from the top right corner of the screen to open Control Center and tap Focus Mode.
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Click to open cooling mode.
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As shown in the image below, a snowflake icon representing cooling will appear in the upper left corner of the screen.