I think the above solution from deadhippo, sounds like it might solve my problem. However, I’m a newbie when it comes to code.
I pasted the above code in my themes function.php here:
function esplanade_theme_setup() {
remove_theme_support( 'cleaner-gallery' );
// Set default content width based on the theme's layout. This affects the width of post images and embedded media.
global $content_width;
if( ! isset( $content_width ) ) $content_width = 700;
This seemed to have no effect and my them still used it’s default lightbox gallery instead of tiled+carousel.