Hi kr.maeots,

Thanks for reaching to us and appreciate your patience.

HTML block is used to create a Mega Menu block and cannot be used in mobile view as the mobile view does not have space enough to reflect it.

You need to create separate multi-level Categories menu for mobile menu https://prnt.sc/19SX5WWqX_6e

Navigate to WoodMart > Header builder > edit default header (highlighted star icon) or you can go through admin bar directly https://prnt.sc/Ct9ehRDvvDV9. Switch to Mobile tab, hover on Mobile menu element, click on Pencil icon to edit it https://prnt.sc/s6iF4ilXjpmW here you assign created menu above to display on mobile. https://prnt.sc/zRLwmIlGloJE https://prnt.sc/N4PrLBOJKMQm

Please refer to this article https://xtemos.com/docs-topic/adding-menu-to-the-site/

Regards,