GravityView: Convert a list view into a grid style (3-col)

grid-view.php

<?php
/**
 * Add the `gv-grid` class to the list container 
 */ 
function my_gv_list_container( $classes ) {
    return $classes . ' gv-grid';
}
add_filter( 'gravityview/render/container/class', 'my_gv_list_container', 10, 1 );

/**
 * Add the `gv-grid-col-1-3` class to the entries container 
 */ 
function my_gv_list_entry_container( $classes, $entry, $instance ) {
    return $classes . ' gv-grid-col-1-3';
}
add_filter( 'gravityview_entry_class', 'my_gv_list_entry_container', 10, 3 );