Using the RDMan from:
https://www.microsoft.com/en-us/download/confirmation.aspx?id=44989
Tools->Options->Full Screen-> last checkbox is 'Use multiple monitors when necessary'
however this has no effect.
**This question is specifically in reference to RDMan, a Microsoft exe that manages multiple RDP sessions from one window (NOT windows's builtin rdp, i.e. mstsc from the runline, they are different softwares).
Works fine using mstsc:
RDMan is on Win7
Host is on WinServer 2008 R2
Best Answer
There is an Option in the Settings
And if you are sizing the Window over the two Monitors or get in Fullscreen you can use both Monitors