I can't change my system language

If you add a secondary language to Windows 10 version 1803 that shares the same base language as the Windows display language, neither language can be removed.

For example: If English (United Kingdom) is the current Windows display language, and you then add English (India) to the Preferred languages list, afterwards neither English (United Kingdom) nor English (India) can be removed from the Preferred languages list.

Note: The most notable effect of having multiple related languages in the Preferred languages list is additional entries in the text input selector. You can remove unwanted language list entries using these steps:

1. From the Start menu, search for powershell.
2. Right-click Windows Powershell in the search results and choose Run as administrator.
3. Type or copy/paste the following command at the command prompt, and then press Enter.

Get-WinUserLanguageList

After typing this command, make note of the “LanguageTag” listed for the language you wish to remove, as you will need it in the next step.

4. Type or copy/paste each of the following commands at the command prompt, and then press Enter. In the following commands, instead of typing <languagecode>, replace it with the language tag you wish to remove, such as en-in for English (India).

$LangList = Get-WinUserLanguageList

$MarkedLang = $LangList | where LanguageTag -eq "<languagecode>"

$LangList.Remove($MarkedLang)

Set-WinUserLanguageList $LangList -Force

Hi 02Hao, there is a known bug in the 1803 version of Windows 10. Microsoft are aware of this issue and hopefully are working on a patch . . .

For the moment, please try this workaround to set your preferred input language (note this tutorial is for US English, just replace appropriately for the Chinese language . . .

Right click your Start Button, choose Powershell (admin)

Run this command to get a list of installed languages on your PC

Get-WinUserLanguageList

Note down the LanguageTag of your preferred language

If say, your preferred language is US English, run this command and hit Enter

$1 = New-WinUserLanguageList en-US

Then run this command to set the order of installed input languages

Set-WinUserLanguageList $1

Close Powershell and restart your PC

I have downloaded 3 languages which is en-us, chinese (china) and chinese (taiwan) but from the list, it only has the first 2 and dun have the chinese (taiwan) which i wan to set as system language. What should i do to make it on the list ?