In Windows 11, high contrast mode is handled through contrast themes.
To learn more about contrast themes, see Change color contrast in Windows.
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Select the Start  button, then select Settings  > Ease of Access > High contrast.
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Turn on the toggle under Turn on high contrast. Then, choose a theme from the drop-down menu. You can customize colors for things like links and button text. When you're done, select Apply.
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To turn off high contrast mode, switch off the toggle under Turn on high contrast.
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To turn high contrast mode on or off from the sign-in screen, select the Ease of access button in the lower-right corner, then turn on the toggle under High Contrast.
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To turn high contrast on or off from the keyboard, press left Alt + left Shift + Print Screen.
