How to gather windows from secondary monitor while remotely connected from OS X to Windows 7
Edit the Connection setting &amp; check 'Scale Content' and 'Use all monitors'.

'Use all monitors' is the key, 'scale content' gives you the choice of scrolling or seeing all at once, but might be too small to read easily.



Just for completeness… that option isn't directly available on Windows until Windows 8.1 &amp; also on Windows it's called 'Smart Sizing'.
To use Smart Sizing in Windows XP or Windows 7 you need to edit your .rdp files with notepad and type in the following line:  

smart sizing:i:1