Enter the Visual Builder mode by clicking on the brush icon in the lower-left corner of the screen (1) and select the Menu (2).
Here you can find all available collections, change their titles, choose icons, rearrange the display order of your collections, and hide those you don't want to appear in the menu.
Scroll down to the very bottom of the page and click the +Add Menu item button to add a link to any website, section to group your menu items, or custom view.
To configure the visibility of fields, select a collection and enter the Visual Builder mode. Note that your collection should be displayed in a Table view. Then, click on the Columns button at the top of the screen to show/hide/rearrange the display order of the columns for this collection.