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What is the VoiceOver cursor on Mac?
When you use VoiceOver, the full-featured screen reader built into macOS, the VoiceOver cursor appears onscreen as a dark rectangular outline. You use the VoiceOver cursor to move around the screen, select buttons and other controls, and to read and edit text. The keyboard focus and mouse pointer work with the VoiceOver cursor in a variety of ways.
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You use VoiceOver Utility to set options to hide the VoiceOver cursor, change its size, and control how it moves when reading text.