Dear Lenovo users, hello! According to your situation, I suggest you wipe the screen and start the test again. See if the tablet mode is normal. If it is normal, consider restoring the system. If it doesn't work, I suggest you send it to a service station for repair.
Service outlets query link:
/Lenovo/WSI/station/service station/default . aspx
I hope I can help you, thank you for your support to Lenovo, and wish you a happy life.