I have an iMac 21.5 inch Retina 4K display. I am trying to connect it to Dell S2319H (1920 x 1080 at 60Hz).
According to Apple website, the iMac supports one 5120x2880 (5K) external display at 60Hz or two 3840x2160 (4K UHD) external displays at 60Hz.
I am using USB-C to HDMI adapter to connect...