Display Usage
The Rhino Pi X1 (Rhino-X1) supports one HDMI output port and one HDMI input port.
Hardware Connection
HDMI Output: The HDMI output can be connected to a monitor, TV, or other HDMI input device to display the system image. Supports up to 1080P / 120FPS output.
HDMI Input: The HDMI input supports video input, up to 4K / 30FPS.
Default Resolution
After connecting the Rhino Pi X1's HDMI OUT to an HDMI display and logging into the GNOME desktop, you can check the default resolution in Settings.

As shown above, the detected resolution is 1920 x 1200.