Hello John,
Thank you for your message.
Could you please clarify what
View mode is used when you're connecting to the remote Host machine?
If you have the Normal or Fullscreen normal view selected, please try switching to the Stretch view or Fullscreen stretch view.
As for the dual-screen issue - could you please clarify if you're able to switch to the
Entire desktop value on the
toolbar when connected to the remote Host in the Full Control and View mode as on the screenshot below?

In addition, if you want to map the remote Host's dual monitors to dual monitors on the Viewer's side respectively - it should be possible to manually stretch the Viewer or Full Control and View window across both monitors. However, we already have the feature that would allow doing this automatically in our wishlist. We will definitely implement this feature in our future updates.
Looking forward to your reply.