Edit

How do I make a link open in a new tab in WordPress?
In WordPress admin panel navigate to Appearance -> Menus, open a menu you need:
Click on Screen Options in the top right, select Link target:
Choose specific Menu Items which you want to be opened in a new tab and then press Open link in a new tab, when done press Save menu button:
More items…
WordPress. How to make specific menu open in a new tab – Template …
https://www.templatemonster.com/…/wordpress-how-to-make-specific-menu-open-in-a-…