The MIUI 12 China beta has introduced a new partial screenshot feature. Here’s how to do a partial screenshot if you’ve got a chance to update your phone to MIUI 12.
1. First, go to Settings > Additional settings > Button shortcuts > Partial screenshot, and make sure “Press and hold with 3 fingers” is selected.
2. You can then press and hold the screen with 3 fingers to get a menu to pick either free-form, square, or circle.
3. Pick an option, and follow the guide shown to select the part of the screen you want to capture.
4. Tap Save.
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