Hi Julius,

Can you please add the code below to your Custom CSS area:

.search-results-holder .result-box .result-image a .image-placeholder, .search-results-holder .result-box .result-image a .image-placeholder>img {
    border-radius: 0px;
}

Also, add this PHP code in the functions.php file (or instead you can use this plugin)

// Disable cropping of search thumbnails
function kalium_search_thumbnail_size_large_filter( $size ) {
    return 'large';
}
add_filter( 'kalium_search_thumbnail_size', 'kalium_search_thumbnail_size_large_filter' );

Have a nice day!