When casting the games console screen to the TV, black borders appear on the TV screen

Some Xiaomi TVs do not support 2560 * 1440 resolution signal input. If the TV is connected to a gaming console, such as an Xbox, and the display is incomplete under the 2560 * 1440 resolution, which is a normal phenomenon.
If devices like Xbox are connected to the TV, the 2560 * 1440 option does not appear. This situation is caused by abnormal signal detection or cable connection issues with the external device, not a problem with the TV. Please check the output settings of the device and ensure that the cables are properly connected.