On the Header of Martfury theme, there is a special menu that directs users to the Product Categories, and it is called: Shop by Department Menu
To change its setting, please go to Customize ▸ Header ▸ Department Menu, at the end of the panel, you will see settings for Shop by Department Menu.
This is the text that shown on the header bar. You can change or translate this phrase in this setting.
This is where you enter the link of your Department page.
Department Menu on Homepage
Here you can see two options: Open and Close.
Note: If you select “Open” option, the Shop by Department Menu will not close when you clicking it.
Choose the Close option to close the Department Menu when users do not use it.
To edit menu items in the Shop By Department menu, please go to Appearance ▸ Menus ▸ Edit Menus ▸ Select a menu to edit ▸ Shop By Department.