When viewing the menu administration page, click on Screen Options (top right), and check the box labelled Link Target under the Show advanced menu properties heading.
Now under the custom link menu item, you will find the option
Open link in a new tab . Check against it.
But you should consider that it is not going to work on those links that scroll to a specific page section!
Is there a way to have one menu item 'url' link open in new window?
When viewing the menu administration page, click on Screen Options (top right), and check the box labelled Link Target under the Show advanced menu properties heading.
Now under the custom link menu item, you will find the option Open link in a new tab . Check against it.
But you should consider that it is not going to work on those links that scroll to a specific page section!