Custom Menu feature gives you the power to add the customized menus to the portal as per the business needs. Here is how you can enable it in your portal.
Navigate to the Appearance → Menus, you will land on the “Edit Menu” page. Select the menu items like Pages, Posts, Custom Links, and Categories to add to your menu. 
For example, if you want to add a custom link to the menu then enter the “URL” and “Link Text” which will be displayed on the portal. Once you are done adding the items, click on the “Add to Menu” button. Let’s configure the “Menu Structure”. 
1. Enter the “Menu Name”
2. Checkmark ☑ “Portal Menu” under the “Menu Settings”
3. Click on the “Save” button