How to remove a keyboard layout from a computer.
Terminal:
Get-WinUserLanguageList
$1 = Get-WinUserLanguageList
$1.RemoveAll( { $args[0].LanguageTag -clike 'en-AU' } )
Set-WinUserLanguageList $1 -Force
Registry Editor:
HKEY_CURRENT_USER\Keyboard Layout\Preload
The number indicates the order in which they are listed in the system "Settings"; "1" is the default layout. Right-click the unnecessary value, then select "Delete."