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$path = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" Set-ItemProperty -Path $path -Name "TaskbarSmallIcons" -Value 1 Stop-Process -Name explorer -Force To revert:

Set-ItemProperty -Path $path -Name "TaskbarSmallIcons" -Value 0 Stop-Process -Name explorer -Force For Windows 11 (unsupported, use with caution): windows taskbar icons size