facetwp custom image sizes

<?php

/** register additional image sizes https://developer.wordpress.org/reference/functions/add_image_size/
 ** you may need to regenerate your thumbnails with a plugin such as https://wordpress.org/plugins/regenerate-thumbnails/
 ** after adding
 **/

add_image_size( 'my_custom_image_size', 300, 200, true ); // 300 pixels wide by 200 pixels tall, hard crop mode