How to get the screenshot button back on your Pixel phone in Android 11

You’ll need to change your navigation.

You might not have noticed many changes to Android 11 when you updated your Pixel phone last week—unless you tried to take a screenshot on your Pixel 2 or Pixel 3. Depending on which navigation method you selected, you might have lost the handy screenshot shortcut that was built into the power button.

While Google has taken away two-button navigation on the Pixel 4 and 4a, it remains on the Pixel 2 and 3, which is where the problems begin.
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https://www.pcworld.com/article/3574942/how-to-get-the-screenshot-button-back-on-your-pixel-phone-in-android-11.html