remove fetured mages from single page

hi guys, i hope someone can help me out ??

i am using portra theme https://portra.wpshower.com/ for a client, but he wanted several modifications to the theme https://marioland.co/

i solved most of the modifications he wanted, except for one:

this theme has a beautiful horizontal gallery sistem, but the problem is that when you have a post that doesnt include a gallery, the theme automatically generates one using the featured image.
i cant find the way to avoid the featured image inside the posts, and thats what i am tring to do.

the only section in all the theme that seems to have something to do with the gallery is this

// single page gallery
	var gallery = {
		duration: 300,
		el: false,
		images: [],
		count: 0,
		first_image: false,
		init: function() {
			this.el = $('.gallery-animated');
			if (this.el.length == 1) {
				this.update();
				if (this.count != 0) {
					this.first_image = $(this.images[0]);
					_window.on('ready load resize', gallery.process);
				}
			}
		},
		update: function() {
			gallery.images = gallery.el.find('img');
			gallery.count = gallery.images.length;
		},
		process: function() {
			var height = gallery.first_image.height();
			gallery.images.each(function() {
				var image = $(this);
				image.off('click');
				if (_window.width() > _tablet_width) {
					var ratio = image.attr('width') / image.attr('height');
					var width = Math.round(height * ratio);
					image.parent().on('click', function(event) {
						event.preventDefault();
						gallery.move(image);
					    });
					image.on('click', function(event) {
						event.preventDefault();
						    if ($('#lightbox').length > 0) {
                            $('#content').html('<img src="' + image.attr("src") + '" />');
                            $('#lightbox').show();
                         }

                        else {
                             var lightbox =
                             '<div id="lightbox">' +
                             '<p>X</p>' +
                             '<div id="content">' +
                             '<img src="' + image.attr("src") +'" />' +
                             '</div>' +
                             '</div>';
                           $('body').append(lightbox);
                        }
                        });
                       $('#lightbox').live('click', function() {
                            $('#lightbox').hide();
                        });
				}
			});
		},
		move: function(image) {
			var scroll = _window.scrollLeft();
			var window_width = _window.width();
			var offset = gallery.offset(image, window_width);
			var index = image.parent().index();
			if (offset == scroll) { // current image clicked
				if (index != gallery.count - 1) { // not last image clicked
					offset = gallery.offset($(gallery.images[index + 1]), window_width);
				} else {
					offset = gallery.offset(gallery.first_image, window_width);
				}
			}
			if (offset != scroll) {
				$('html, body').stop().animate({ scrollLeft: offset }, gallery.duration);
			}
		},
		offset: function(image, window_width) {
			var offset = image.offset().left;
			var width = image.width();
			if (width < window_width) {
				offset -= Math.round((window_width - width) / 2);
			}
			return offset;
		}
	};
	gallery.init();

i dont know what to do with this.
i just want the featured images out of the single posts.
here is an example: in this posts we have some videos, we wanted no gallery, but the theme generated one with the featured image on the right side https://marioland.co/soldados-derretidos/

thanxs ??