How to use the RDP Multimon switch, or toggle for C30LE?

How to use the RDP Multimon switch, or toggle for C30LE?

I am trying to use a dual monitor setup for our Wyse C30LE.

Currently we are able to Span using the standard RDP toggle. However in newer version of RDP there is also a toggle to "use all my moniotrs for the remote session". This should allow for the use of the

/multimon switch for MSTSC.

Is there either a way to upgrade the RDP version on the Wyse Terminal, or use the /multimon switch?

Or another way to accomplish having two monitors working, but not as one giant spanned monitor.