There is a black block at the top right of the screenshot in Xiaomi's mobile phone voice call. Why?

It is because Xiaomi mobile phone has turned on the "color reversal" function, which can solve the problem by turning it off.

Xiaomi mobile phone is a high-performance fever-level smart phone developed by Xiaomi Company (full name Beijing Xiaomi Technology Co., Ltd.).

Xiaomi mobile phone adheres to the design concept of "born for fever" and applies the world's top mobile terminal technology and components to every new product. The high cost performance of Xiaomi mobile phone also makes every product the most anticipated smartphone of the year. Xiaomi mobile phone adopts online sales mode.