Mohammad Taqui Sayed

I dont know if I understood that correctly but you can do it with some script and css

jQuery(document).ready(function(){

    var stickyNav   = jQuery('#top_most-SupernovaSticky-wrapper');
    var hNavPos   = jQuery('#nav_wrapper').offset().top;   

    jQuery(window).scroll(function(){
        if(jQuery(this).scrollTop() > hNavPos){
            stickyNav.fadeIn();
        }else{
            stickyNav.fadeOut();
        }
    });
});

Some css

#top_most-SupernovaSticky-wrapper{display: none;}

But I think you are right about not showing featured image when full content is being displayed , so I removed it now.

I dont think they are becoming squares , look on the demo site http://supernovathemes.com/supernova/post-23/

That makes sense, I think I should give an option to turn off responsive design for tablets too. I m already working on the theme and making every attempt to make it useful for everyone. Thanks for reporting it.

Didn’t understand the question.