I'm using 3 monitors with display port and a RX 480 and Windows 10. With version 17.7.2 it worked but with 19.9.2 it doesn't. the Option to resize the Dekstop is also missing.
Same problem here with the last recommended drivers with 5700 XT with 3 monitors, I can see option for eyefinity but i have not option for bezel compensation and Resize destokp.