Extend server desktop across two monitors

This old guy is confused. I have done a lot of searching, but have not found info about this setup.

Installed Server version 7.13.1 on Windows 11 PC. The server PC has dual monitors and its desktop spans these two monitors. When I connect to the server using my remote PC (which also has dual monitors and extended desktop), the display on the remote/client PC presents the RealVNC connection with one window with one very wide display of the server PC desktop.

How can I get the server's desktop (that very wide window) to span across both remote/client monitors? I have looked at the 'switch monitor' feature in the client's toolbar. While this apperas to work, it does not utilize both client monitors. [I have tried 'single monitor' and 'allMonitor' settings but neither accomplishes the objective.]

Is what I want 'doable' and how can I do that??

Remember: I am an old guy, so simple and step-by-step is wonderful!!