Thanks Paul!
I'm a bit confused now. Apologies if my knowledge about Joomla and its aspects is not comprehensive enough to understand your suggestion. As far as I could get from your answer, seems I can use both Helix and SP page builder together in my Joomla website, is it correct?
I have no problem using templates, meanwhile, there I don't insist to use a mega menu as a module. The only thing I'mafter is to have a mega menu in my current website. So, is it possible to use Helix? If so, could you please advise some sources to get how? The tutorial I saw in Jommshaper was based on installing a fresh Joomla website with Helix quick installer package.
Appreciate your assistance.