So I've seen this article on using a subset of monitors in an RDP session. In my case, I have to log in through a gateway in my browser before clicking a link to open "Pulse Secure" which connects me to my host through what looks like a standard Windows RDP session. Can I overwrite the default settings that the RDP session opens up through that gateway so I can apply the selectedmonitors:s: command?
As far as I can tell, the gateway website has options in the UI that are word-for-word copies of the Windows Remote Desktop Connection Configuration app, so I'm guessing that the options must be somehow being pulled from the website and then passed along to Windows when "Pulse Secure" is launched.