Hello.
Language switcher menu works fine only on desktop, on mobile devices no language menu is displayed.
This issue can be observed on demo site for this template.
http://demo2.joomshaper.com/2019/megainc/index.php/en/
I have the same thing on my website, the whole section starting with this code is absent on the mobile:
"<div class="chzn-container chzn-container-single chzn-container-single-nosearch chzn-with-drop chzn-container-active">"
Tested on Firefox, Opera, Chrome on Samsung Galaxy S7 and by Developer Tool in desktop Firefox and Opera.