to make the link open in new page, slight changes on the li item (laravel blade template) to include new class named as 'nestedmenu' :

<li><a href="{{ url('myurl') }}" class="dropdown-item nav-link nestedmenu"><i class="fa fa-mygreaticon fa-fw"></i>MyPage</a></li>

then in scripts :

$('.nestedmenu').on('click', function (e) {

e.preventDefault();

var url = $(this).attr('href');

window.open(url, '_blank');

});