How to Setup Keyboard Language Switching on Windows 10
1) Press the start button and type "Edit Language and Keyboard Options."
2) Open the settings and click "Add a language."
3) Type the needed language, select it, and click "Next" then "Install."
4) Select the "Keyboard" within the same settings window.
5) Important: Enable "Use the desktop Language bar when it's available."
6) Select the "Language bar options", “Float on Desktop” and click "Apply" and "Okay."
Once in LockDown Browser for Windows, a small window should appear in the top right allowing you to click on the desired language for the keyboard.