That would require a few edits to the JavaScript file, if you’re comfortable? So edit assets/vega-wp.js and change this block of code
$('.menu-header .page-scroll a').click(function(){
jQuery('.menu-header .page-scroll>a').removeClass('showing');
jQuery(this).addClass('showing');
var href = jQuery(this).attr('href').split('#');
var Header_height = jQuery('.navbar-custom').innerHeight();
if(href[1]){
if(jQuery('#'+href[1]).length>0){
var posEle =jQuery('#'+href[1]).offset().top - Header_height;
jQuery('html,body').animate({scrollTop:posEle},600);
return false;
}
}
});
to
$('.page-scroll a').click(function(){
jQuery('.menu-header .page-scroll>a').removeClass('showing');
jQuery(this).addClass('showing');
var href = jQuery(this).attr('href').split('#');
var Header_height = jQuery('.navbar-custom').innerHeight();
if(href[1]){
if(jQuery('#'+href[1]).length>0){
var posEle =jQuery('#'+href[1]).offset().top - Header_height;
jQuery('html,body').animate({scrollTop:posEle},600);
return false;
}
}
});
Hope that helps.