Poor, poor, poor design by M$ (surprise, surprise). The option to change the settings for "switch keyboard layout" require that the user select "Between input languages". I saw this setting twice as I searched for the option to turn the *&^#@%@ thing off (brilliant initial design, using two keys immediately beside each other that can easily be hit together accidentally). Unfortunately, the description mentions changing languages rather than keyboard layouts (these are NOT the same thing, even in the M$ warped view of the world, but you have to open that dialog to discover that there is, indeed, a setting for keyboard layout).
If you are trying to change these settings, follow the instructions above (and then you can curse microsoft quietly and just for fun instead of when you can't type anything comprehensible because of their poor design choices).