Hello Gordon, this is Emily.
When you establish a remote connection to another computer using a single display, all the content displayed on the remote computer's multiple screens will be consolidated and presented on your local single display.
To illustrate, suppose the remote computer has the Edge browser on display 1 and the Chrome browser on display 2. When you initiate the remote session, both the Edge and Chrome browsers will appear on your local computer's remote application, displayed together on the same screen. Initially, they may overlap, but you can easily manage them using the taskbar icons to arrange them as needed. I hope this clarifies the concept.