Thanks for contacting us and choosing our product!
Sorry for the late response because your topic included too much links and it automatic got blocked.
We have just checked your site and you need to set Mega Menu width Stretch here: https://prnt.sc/6-AbTMsQui6m
You can reference 5.2.2 in the document here: https://document.harutheme.com/teespace/
Hope this helps!