Why is the center clear but the edges blurry when capturing text with the POCO F7 Pro's camera?

We sincerely apologize for any inconvenience this has caused. The camera lens features a precision aspherical lens design with multi-layer coating, ensuring high light transmission efficiency and excellent optical imaging performance.  
However, due to the optical principles such as field curvature and large aperture effects, when using the main camera to capture flat objects at close range, there can be inconsistencies in sharpness between the center and the corners.  
To solve this issue, you can try taking the photo from a slightly greater distance. And you can increase the zoom for better clarity.