The Xiaomi Pad 6 supports palm rejection which is a technology commonly used on touch devices, especially tablets and some high-end smartphones to prevent accidental operation caused by the touch of the palm or other parts of the hand on the screen when using a stylus or fingers for fine operations.
For your reference, here is more information as below:
With this technology, the device can distinguish different touch types such as stylus, fingers, and palms. When the palm or other non target parts come into contact with the screen, the device will ignore these touches to prevent accidental operation. It can also ensure that the input of the stylus is more accurate and not affected by other touches during painting, writing, or fine operations.