Hello,
Thank you very much for choosing our theme and for contacting us.
You can customize the sticky mobile menu in the Theme Settings > General > Mobile bottom navbar https://gyazo.com/99f3a89a9a9ac9d2caace76a0b775a01 you will see the option to add the mobile menu, where you can show the Product categories menu: https://xtemos.com/docs-topic/adding-menu-to-the-site/
Thus, you need to remove the items you do not need and add the mobile menu.
Please add this code to the Theme Settings > Custom CSS > Global:
body .wd-nav-vertical.wd-design-default>li:not(:last-child) {
border-bottom: 1px solid transparent;
}
body .wd-nav-vertical.wd-design-default {
border: 1px solid transparent;
}
This code would remove the border. If you have any questions please feel free to contact us.
Best Regards