We use the Dynamic Custom Properties extension to pull a powershell object of these kinds of details whenever the machine connects. Then we can create session groups based on this, or just view it in the commands tab.

I use a combination of powershell and procexp to accomplish this in backstage.

In powershell,

Install-Module -Name DisplaySettings

Set-DisplayResolution -Width 1920 -Height 1080

This will set the screen resolution. 

The backstage shell will be incorrectly sized, so launch procexp from the toolbox and find Screenconnect.WindowsBackstageShell and rightclick, Restart. This will re-launch the WindowsBackstageShell at the current resolution.