# Run the following code in PowerShell

# replacing theme_name with the theme of your choice

C:\Windows\Resources\Themes\<theme_name>.theme

# For example: C:\Windows\Resources\Themes\dark.theme

# Note: Make sure you enter the correct theme filename that is 

#       present in C:\Windows\Resources\Themes\ directory

​

# For frequent use, save and run the following code as a PowerShell script

param(

    [string]$theme_name = "dark"

)

$command = "C:\Windows\Resources\Themes\" + $theme_name + ".theme"

Invoke-Expression $command

Start-Sleep -Seconds 2

Stop-Process -Name SystemSettings

​

# Please upvote if this helped you

https://stackoverflow.com/a/74835941/7753274