Plug the Satechi Core USB-C to 4K HDMI Adapter into the USB-C (USB 3) port on your MacBook Neo. This is the port closer to the hinge.

MacBook Neo has two USB-C ports that look the same but work differently. Only the USB 3 port supports video output. The adapter will not work in the other port (USB 2), which is the one closer to the trackpad.