See ScreenResolution

This is a PowerShell Script that show the Screen Resolution of the remote computer screens.
if there is no second screen the output will indicate that there is no secondery screen.

$primaryScreen = [System.Windows.Forms.Screen]::PrimaryScreen
$prineryr = "{0}x{1}" -f [System.Windows.Forms.SystemInformation]::PrimaryMonitorSize.Width, [System.Windows.Forms.SystemInformation]::PrimaryMonitorSize.Height

$secondaryScreens = [System.Windows.Forms.Screen]::AllScreens
if ($secondaryScreens.Length -gt 1) {
    $secondaryWidth = $secondaryScreens[1].Bounds.Width
    $secondaryHeight = $secondaryScreens[1].Bounds.Height
} else {
    $secondaryWidth = $null
    $secondaryHeight = $null

# Display the resolutions
"Primary Monitor: $prineryr"
if ($secondaryWidth -ne $null -and $secondaryHeight -ne $null) {
    "Secondary Monitor: ${secondaryWidth}x${secondaryHeight}"
} else {
    "No Secondary Monitor detected."

To download the command click here.
Once downlod complete, import it throw the import option in the Custom command section.

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