Hello,

Please update your theme to the recent 4.1.0 version. https://xtemos.com/docs/woodmart/faq-guides/3-x-4-0-migration-guide/

Then switch to the mobile view of the header and enable showing the category menu in the Mobile menu element, here are the instructions: https://xtemos.com/docs/woodmart/adding-menu-site/

Best Regards