Update = After completing troubleshooting, a DELL-Cares agent setup a  replacement.
Finally got my U3223QE. Note that I already had the U2723QE.The U3223QE seems to work well except for two things: the Preset Modes Movie and Game don't work. The display becomes like a 8 colors monitor. All other Preset Modes work fine.Note that the Preset Modes Movie and Game are working fine with my U2723QE. They are connected to the same computers (PC and Mac) in dual display. I tried on macOS and Windows 10, same problem. I installed the drivers on both OS, same problem.Any ideas?
U3223QE, problem with Preset Modes Movie and Game