Recently, we have come around a strange issue regarding this. Here is how you can reproduce the issue:

  1. Add a second keyboard input language.
  2. Make sure that in the Control Panel > Clock, Language, and Region > Language > Advanced Settings, Let me set a different input method for each app window option is checked.
  3. Check if you can switch between input languages using Alt + Shift or Windows key + Space key combination.
  4. Open File Explorer. Set the cursor in the “Search” field, start typing in one language, then switch to the second language, type several more characters, switch back to the original layout, type again, watch the language bar disappearing and keyboard switching disabled. Go to Control Panel > Clock, Language, and Region > Language and change language order or move up or down them. Recheck if the issue persists, you’ll find the problem still exists.
  5. Repeat steps 1-4 with Let me set a different input method for each app window option mentioned in step 2 as unchecked. You won’t face any issues. Thus in this way, we have found that something is wrong with language configuration and you can fix it via these steps:

Can’t switch keyboard language in Windows 11/10

  1. Press Windows Key + R combination, type put regedit in Run dialog box and hit Enter to open the Registry Editor.

  2. Navigate here:

  3. In the right pane of this location, right-click and select New > String Value. Name the newly created string as ctfmon. Double click on the same string to get this:

  4. In the above-shown window, type the Value data as CTFMON.EXE and click OK. You may now close Registry Editor and verify the status of the issue, you’ll find that problem is solved now. That’s it! How to restore the missing Language Bar may also interest you.