Language switching with Polylang and can't use WPBakery

Hi,
I just purchased the Sanabel theme and also activated Polylang, added several pages in different 3 (and some in 4) languages, but can’t seem to find how to add language switching to the menu, even though my website should be in 4 languages.

The theme description also stated that Visual builder would be available, but I can’t use it because it asks to be activated for another $45.