<p>In Windows 10, by default, pressing CTRL+SHIFT (or for some ALT+SHIFT - thanks madmenyo ) will cycle through any keyboard layouts that you might have mapped and it’s surprisingly easy to do this by mistake.</p>
<p>If you keep pressing CTRL+SHIFT (or whatever you might have changed it to) then soon you should get back to the correct setting. (alternatively reboot which is what I did first time <img src="https://forum-microsoft.fr/images/emoji/twitter/wink.png?v=15" title=":wink:" class="emoji" alt=":wink:" loading="lazy" width="20" height="20"> )</p>
<p>(Updated Aug 2019) You can change/disable this by</p>
<pre><code class="lang-auto">> Settings > search for 'typing' > Advanced keyboard settings > Language
Bar options > Advanced Key Settings (tab) > Change Key Sequence
</code></pre>
<p>Be warned, the above doesn’t always work - Restarts and Sleep mode can both change keyboard default (usually to US) - I’ve found no cast-iron solution though creating a new profile can help, though not a particularly satisfactory answer IMHO.</p>
<p>In an emergency</p>
<pre><code class="lang-auto">WIN+R
osk
</code></pre>
<p>to bring up the On Screen Keyboard might help temporarily.</p>
<p>Also note that it’s possible to disable this so that no key combination will change the language - change the keys to “Not Assigned” - see answer below from Mort for more info</p>
