I just installed https://github.com/patrick-zippenfenig/us-with-german-umlauts since I kind of need it because I am used to it. It works perfectly fine, as long as my mouse´s focus is on the MacBook´s own display. It stops working as soon as I am working on an external Display (Samsung 5K G9 if that matters).

This behavior applies to both, the MacBooks own keyboard as well as my bluetooth external one.

It is a MacBook Pro 14" with Monterey 12.0. Also, I noticed that my keyboard icon isn´t working on the top right. So it looks like I got two Keyboard Layouts set up, depending on the display focusd.

Does someone know how I can fix this?

  • Have you reached out to the developer and asked about this issue?
    – agarza
    Nov 9, 2021 at 20:47

1 Answer 1


You can show the keyboard icon in the menu bar by going into System Preferences > Keyboard > Input Sources and enabling Show input menu in menu bar.

Sometimes, if you have multiple keyboard layouts enabled, macOS switches them automatically when you switch between apps or windows, which probably happens when you change the focus to a different display.

When this happens, you can switch back manually to your desired layout via the input menu. Alternatively, you can disable this behavior by unchecking Automatically switch to a document's input source, also in System Preferences > Keyboard > Input Sources.

  • It is hard to see any connection between your answer and the question, which asks why a custom keyboard layout is not working on an external display. Nov 10, 2021 at 15:56
  • @TomGewecke macOS might be automatically switching the keyboard layout when the focus changes from an app in the built-in display to a different app or window in the external display. Sorry for not mentioning that explicitly in my answer.
    – dee.ogo
    Nov 10, 2021 at 17:07

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