Supreme Theme Blog Search results page

Roman, try this code on your child theme’s functions.php file

Heads Up: This code is not properly tested. So make sure its not breaking GD search results by testing it properly.

// search filter
function roman_custom_search_filter($query) {
    if ( !$query->is_admin && $query->is_search) {
        $query->set('post_type', array('post') );
    }
    return $query;
}
add_filter( 'pre_get_posts', 'roman_custom_search_filter' );