Please, confirm the permission for plugins deactivation, switching to the parent theme. As soon as we complete the testing we will enable all back, however, the site would be without plugins for 15-20 min. You would better make the full backup of your site.
Mobile view does not support megamenu blocks. You need to create a separate product category menu without a mega menu, you can create a multy-level menu, but without a megamenu.
If you have any questions please feel free to contact us.