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We tried everything you posted before with no joy. It just wouldn't connect directly, and when she met with the IT department, apparently it's only possible to connect through Chrome and then using MS RD web client. But...
What you've put above has worked. It really worked. She hadn't even noticed the "Show options" on the connection window. Although the setting were the same as your screenshots, I just checked the "Use all my monitor for the remote session", and it's now working full screen. This whole situation is just so she can access the student database at home, which is the only bit of the puzzle missing.
Honestly, thank you for helping with this.
Did you try to connect without bothering with a Windows desktop? I know you said their IT claimed you needed it, but that seemed unlikely. Posted a reply last time
https://www.lfgss.com/comments/16173403/incontext/
The resolution should be set in the remote desktop profile rather than on the client.
something like the pic below