I have a Radeon RX580 and I cannot change the resolution of the second display as it is grayed out. I am using two Dell E2213 displays connected to the card with a Display Port cable. My system is a MSI XPower Motherboard M/N MS-7666 with i7 Processor and 12GB of memory. I have tried to uninstall and reinstall the monitor in Device Manager but no go and I have also used the DDU and then reinstalled but still the same issue. I had a GeForce GT 730 before and did not have this problem. Any ideas? Thank You.☺