In many remote desktop solutions ou can decide the size of the remote host desktop and don't have to take it as is.
That's also for the windows native remote desktop session. OPen the rdp file in an editor and look for the lines with desktopwidth and desktop size.
You don't connect to the remote display, you connect to a remote desktop, and that has the size of your choice, not the size recommended by the host hardware, a usual terminal server even doesn't have a display.
Chriss