Can mirrored (shadowed) rdp sessions go fullscreen?

Question

If I use the /shadow:1 parameter to mirror a user's screens, the opened rdp window ignores the /f and cannot be sent to fullscreen by any means I know of.

In "normal" RDP sessions the user can right-click the top-bar and go to fullscreen, but that control is missing in rdp windows spawned with the /shadow parameter.

Why do shadowed rdp sessios behave differently? Is there a way to make it go fullscreen? Preferably with invidual monitors? I want to use rdp shadowing to easily stream individual students' monitors to a beamer.

Answer 1

This is by design. The only parameters taken into account when shadowing are:

Mstsc.exe [/shadow:sessionID [/v:Servername] [/control] [/noConsentPrompt]]

Specifically, you cannot specify any parameter for width, height or full-screen.

This limitation has existed since 2016, where it is stated:

Your session must be capable of supporting the video resolution used at the session that you are remotely controlling or the operation fails.