Hi Ckury,
Please follow the following steps to fix your issue;
Go to Dashboard => Appearance => Menu => After you go to menu you can get Screen Option in right sidebar which is kept in above like this image and if you click in the screen option you can see the link target so please select it as in this image => Then you need to make custom links menu when you make a custom links menu you can get option to “Open link in a new tab” so you need to select as in this image => And save menu.
We hope this will be helful to you, if not then please let us know.
Thanks
Thread Starter
ckury
(@ckury)
Thanks so much! So appreciated, works great now!