Edit: SOLVED. It turns out, I had uninstalled the system package `com.android.inputdevices` , which is used to locate available keyboard layouts.

Afbeelding


Afbeelding


This is on a Samsung Galaxy S23 using Heliboard and Simeji as software keyboards. Samsung’s keyboard is uninstalled. On my Galaxy Tab A9+ with the exact same configuration, I am able to set the default keyboard layout…

Any ideas?