Apple Accessibility
Switch Control and Accessibility Keyboard Guide
If you use adaptive devices or have difficulty with a physical keyboard, Switch Control and the Accessibility Keyboard make it easier to use your Mac and your favorite apps.
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This guide explains how to use Switch Control to enter text, interact with items on the screen, and control your Mac. It also explains how to use the onscreen Accessibility Keyboard (with Dwell) to navigate macOS and enter text, and the Panel Editor to create custom panels.