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How To Enable Android Phone Accessibility Features
Google has designed many Accessibility features for Android to provide people with disabilities an enhanced user experience that's more comfortable and convenient to navigate. While Accessibility features are primarily intended for people with disabilities, they can also be helpful tools for anyone to customize their phones to fit their specific needs and preferences.
To find the Accessibility Menu:

1. Open Settings and go to Accessibility. Under "Interaction Controls," select "Accessibility Menu."

2. Toggle the "Accessibility Menu shortcut" and select Allow. Then tap "Got it." The Accessibility Menu button should appear as a floating icon attached to the right side of the screen.
If the controls are too small, you can change their size in the Accessibility Menu Settings by opening your Settings App, then Accessibility > Accessibility Menu > Settings to turn on "Large Buttons." There are other Accessibility features available in the Settings app, such as Select to Speak, Dark Mode, Color Inversion, Magnification, and TalkBack.