Keyboard Layout after startup reverts to "ABC - Extended" when using FileVault

Question

I am an ordinary QWERTZ keyboard user. Now, when I setup my mac, I neglected the Keyboard Layout setting (I thought it would default to the usual). But, the layout was set to ABC - Extended.

I can change it back to QWERTZ, but every time I restart my mac it reverts back to the ABC setting.

My keyboard does not look like this (But part of me does wish it did).

How can I permanently change the setting of the keyboard layout at the login screen?

After updating to macOS Mojave I still have this problem, so the setting must have slipped back in through my TimeMachine backup.

The screen in macOS Mojave. There are some weird UI issues with Dvorak - QUERTY ⌘.

This are my Language and Region settings:

And my user settings:

The problem persisted after I have updated to macOS Catalina.

These are my keyboard settings:

Update:

I could shed some light onto this issue. The ctrl.blog, which was mentioned in the comments mentions that FileVault might plays a role in this. So these are the steps I did follow:

1. Reboot
2. "ABC - Extended" is chosen as the language at the login dialog
3. Choose German and sign in
4. Reboot
5. "ABC - Extended" is chosen as the language at the login dialog
6. Change the language and sign in
7. Disable FileVault and wait for it's completion
8. Reboot
9. The Loginscreen looks a bit different now, I'm able to scroll with the mouse wheel and I'm able to choose "Remove current from list" in the language menu.
10. Sign in and Reboot
11. FINALLY: The language is now still set to German.
12. Enable FileVault again (hoping that the currently set language will be used as the new Default).
13. Wait until FileVault is activated (another few hours)
14. Reboot
15. There we go again: ABC is again set as the default

I did submit this Feedback to Apple as of November 13 2019.

Answer 1

I wrote an article called How to fix macOS startup keyboard layout not persisting about this very problem.

I never figured out exactly what the problem was, but the ABC Extended keyboard layout is the default fallback when no other keyboard layout is configured. The pre-boot environment stores its settings separately from the rest of the system.

Sometimes these settings go out of sync, or the system fails to save settings to the pre-boot environment. You’re more likely to run into this when using FileVault disk-encryption because of the increased complexity in this setup.

I lay out 11 steps in the above article that gets macOS to regenerate the settings file in the pre-boot environment. With the help of my readers, I’ve identified at least three different problems that these steps can resolve. It’s easier to just diligently follow all the steps exactly than to first try to identify the exact issue and then try to fix it.

Answer 2

If you don't use ABC - Extended or any other keyboard layout, you can simply remove them permanently from your list of keyboards.

1. Go to Settings > Keyboard > Input Sources
2. Select the keyboard you want to remove
3. Click the - icon at the bottom

Answer 3

Follow these steps:

https://support.apple.com/en-us/HT202036

We Dvorak folk have to do this all the time...