When the M 2 iPad Pro is connected to an external portable screen, the resolution is extremely low and there are no arrangement options, making it impossible to expand the screen use

https://imgur.com/PFVODh7 As shown in the figure, the red cable is the standard HDMI-Mini HDMI cable used in the portable screen, and the black cable is the cable connecting the docking station to the iPad The portable screen uses a Mini HDMi connection, while the standard HDMi connects to the docking station After connection, it can only be mirrored, and there is no "arrangement" option in the "display and brightness" of the iPad settings, so the front-station scheduling cannot be turned on And the resolution of the portable screen after mirroring the picture is only 720x480 There is a search in Google that when the iPad is connected to an external monitor, the resolution lower than 1080p does not give arrangement options. I don't know if this is the reason, but now this monitor is a 1080p monitor. After connecting it, it is only so low. I don't know what the reason is The purpose is to connect this display to iPad and turn on front scheduling to expand the screen