The code for carousel vertical is in templates/property_pictures3.php file.
Images are resized using these resize rules: listing_full_slider, listing_full_slider_1 and wpestate_slider_thumb
To remove the resize rule for images must edit templates/property_pictures3.php and replace above resize rules with full.
Next must add below css in Theme options – Design – Custom CSS ( help: https://help.wprentals.org/article/3029/ )
.carousel-inner .fancybox-thumb img { height: 337px!important; width: auto!important; } @media only screen and (max-width: 840px){ .carousel-inner .fancybox-thumb img { height: auto; } } @media only screen and (max-width: 568px){ .carousel-inner .fancybox-thumb img { height: auto!important; width: auto!important; } } .single-estate_property #carousel-indicators-vertical li img { margin: 0px auto!important; float: none; left: 0px; right: 0px; display: block; } #carousel-indicators-vertical img { width: auto; height: 83px; } .single-estate_property #carousel-indicators-vertical li img { margin: 0px auto!important; float: none; left: 0px; right: 0px; display: block; } .single-estate_property #carousel-indicators-vertical li { background: #323a45; }