A PowerShell script for quickly toggling between duplicate and extend display modes on Windows

ToggleDisplayMode.ps1

# Path to custom registry key for tracking display mode
$registryPath = "HKCU:\Software\CustomDisplayToggle"
$keyName = "DisplayMode"

if (-not (Test-Path $registryPath)) {
    New-Item -Path $registryPath -Force | Out-Null
    New-ItemProperty -Path $registryPath -Name $keyName -Value "Duplicate" -PropertyType String -Force | Out-Null
}

Start-Sleep -Seconds 1

$currentMode = (Get-ItemProperty -Path $registryPath).$keyName
if ($currentMode -eq "Duplicate") {
    # switch to Extend
    DisplaySwitch.exe /extend
    Set-ItemProperty -Path $registryPath -Name $keyName -Value "Extend"
} else {
    # switch to Duplicate
    DisplaySwitch.exe /clone
    Set-ItemProperty -Path $registryPath -Name $keyName -Value "Duplicate"
}