I use Citrix in full screen on 2/3 monitors. I havent tried all 3 monitors as I use one outside of citrix and I need it to work this way. Usually I just auto hide the taskbar so I can utilize my whole scrreen howeverr the autohide function is no longer working reliably. I'm having to restart dispplay fusion frequently. I have already forced all citrix related exe to be viewed as full screen. The one in the scrreenshot is what casts the virtual machine to my screen.