Hi Ignacio,
Thanks for reaching out!
This feature will require some customization. We will just give you a piece of code as a starting code. Please add the code in your Pro > Theme Options > JS.
jQuery(document).ready(function( $ ){
$('.x-author-social').each(function(){
if ( $(this).attr('target') == '_blank'){
$(this).attr('rel','noopener');
}
})
});
Please note that custom code is outside the scope of our support. Issues that might arise from the use of custom code and further enhancements should be directed to a third-party developer or you can avail One where we can answer questions outside of the features of our theme.
Hope that helps.
Thank you.