Why cannot use the Xiaomi Focus Pen to make circular annotations on the Xiaomi Pad 7 Pro?

The Xiaomi Focus Pen uses a virtual laser to convert the pen’s spatial posture into changes in the plane coordinates. However, it's important to note that this is not an actual laser. As a result, the position of the pen tip does not directly correspond to the cursor position on the screen. This can cause difficulty when trying to make precise circular annotations.
To achieve optimal performance, it is recommended to use the pen in a specific way, hold the pen using the "baton" grip method, where you keep your arm still and only rotate your wrist. This technique helps to ensure more accurate movements and smoother annotations. By adjusting your hand posture, you'll have better control over the pen’s movements, making it easier to draw and annotate on the screen.