How Custom Menu Link  Target Blank

you don’t need to add target=_blank anywhere in your wordpress theme code. Just follow the steps

Go to Menus, and from the top right side, click on Screen Options.

As shown in the screenshot below, click on Link Target under the Show advanced menu properties.

Now Link Target option added in you drop down menu.

Go To Apperance >> Menus  >> choose any Menu from List and Click on any URL . Check the box Now Open link in a new window/top.

If you confused see the below image

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