Samsung Galaxy S21 5G User Manual page 75

Camera and Gallery
Screen recorder settings
Control the sound and quality settings for the screen recorder.
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From Settings, tap
Sound: Choose what sounds to record while using the screen recorder.
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Video quality: Select a resolution. Selecting a higher resolution for higher
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quality requires more memory.
Selfie video size: Drag the slider to set the size of the video overlay.
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Advanced features > Screenshots and screen recorder.
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