mayllave

Thanks @bcworkz, I got a response to another query of the same nature (different website), and the direction given to me worked.

Sharing here:
from @magentomaster

I can see there is default issue with elementor page builder you have applied display not to the header.

Please add this CSS to the style.css at the bottom

@media only screen and (max-width: 600px) {
  .elementor .elementor-hidden-mobile, .elementor .elementor-hidden-phone {
	display: block !important;
	z-index: 9999 !important;
}
}

Thanks @magentomaster this worked!