1. Open the phone, find the Settings option on the desktop of the phone, and click to enter.
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2. Then click the menu item \"Lock screen, password and fingerprint\" in the Settings page of the Xiaomi phone.
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3. Next, click the \"Lock Screen Advanced Settings\" menu item.
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4. On the lock screen Advanced Settings page, locate the Settings item of Save Case Lock\/Unlock.
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5. On the open protective cover switch page, find the setting item of the protective cover switch and click to open it.