How to avoid keyboard layout automatically changing on windows 10

Below is the answer for anyone interested. It is in two parts for now, I'll edit it when I have time.

  1. One of the questions in the related questions put me on the right track, though I have not solved the issue yet.

On my computer (and apparently and Windows 8 and above), the Ctrl + Shift (not Alt + Shift) key combination is used to switch keyboard layouts. I disabled the Alt + Shift combination (that was theoretically active, but did not work) by going to Control Panel\Clock, Language and Region\Language\Advanced settings\Change Language Bar hotkeys ; but the Ctrl + Shift combination still switches keyboard layout, although it does not appear anywhere, and I cannot figure out why.

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  1. FINAL WORD: There are actually TWO hotkeys, one which changes input languages (which is, by default, Alt+Shift) and one which switches keyboard layouts (by default, Ctrl+Shift).

The definitive steps to see those settings are :

  1. Go to Control Panel\Clock, Language and Region\Language\Advanced settings\Change Language Bar hotkeys
  2. In the "Advanced Key Settings" tab, select "Between input languages" and click on "Change Key Sequence..."

You can now choose to enable, disable or change the two shortcuts I mentioned earlier.

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