The fingerprint pattern under the screen of millet mobile phone is round by default, if your fingerprint pattern is not round, it may be due to the following reasons:
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1. Your Xiaomi mobile phone system version is too low, you need to upgrade to the latest version.
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2. The fingerprint sensor of your Xiaomi mobile phone is faulty. It is recommended to contact after-sales service for repair.
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If you are sure that your Xiaomi phone system version is already up to date and the fingerprint sensor is not faulty, then you can try the following methods:
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1. Enter the \"Settings\" app of the Xiaomi phone, find the \"fingerprint and password\" option, and enter the \"fingerprint unlock\" interface.
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2. Tap the Fingerprint Unlock Settings button. The Fingerprint Management page is displayed.
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3. On the Fingerprint Management page, select Customize Fingerprint Pattern and click.
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4. On the Customize Fingerprint Pattern screen, select the Circle shape and start drawing your circular fingerprint pattern.
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5. After the drawing is complete, click the \"Save\" button to exit the \"Customize fingerprint pattern\" interface.
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6. Re-enter your fingerprint information, you can use the circular fingerprint pattern to unlock.
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Please note that if you are using the MIUI system of a Xiaomi phone, the above steps may be different. If you encounter problems, it is recommended that you check the official help documents of Xiaomi mobile phone or contact after-sales service for consultation.