Hello,

You can assign the language switcher to the menu that is already in the header builder.

If you want to add a wdiget, follow these steps:

1. Create a sidebar in Dashboard > Sidebars;

2. Add the language widget to this Sidebar;

3. Create HTML block and add Widgetized Sidebar element, chose your sidebar;

4. Add the HTML block to the Header Builder: https://xtemos.com/docs/woodmart/html-blocks-2/#header_builder

Best Regards