Making specific applications exempt from optimization
Power-saving features lower the priority of certain non-essential device functions. If you do not want an application to be affected, you can make it exempt in the Power-saving exceptions menu.
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Find and tap [Settings] > [Apps & notifications] > [Advanced] > [Special app access] > [Power-saving feature].
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Follow the on-screen instructions, and select the applications to which the power-saving feature is applied.