PixTypes does not work for multisite wordpress

I have a multisite wordpress. I installed and activated pixtypes. In the theme, I set up the metaboxes as below. The metaboxes successfully appears on my main site in the multisite., but none of the sub sites shows the metabox.

$pixtypes_conf_settings = array(
			'first_activation' => true,
			'metaboxes'        => array(
				'_job_listing_the_aside' => array(
					'id'         => 'job_listing_aside',
					'title'      => esc_html__( 'Gallery Images', 'mvp' ),
					'pages'      => array( 'job_listing' ), // Post type
					'context'    => 'side',
					'priority'   => 'low',
					'show_names' => true, // Show field names on the left
					'fields'     => array(
						array(
							'name' => esc_html__( 'Gallery Image', 'mvp' ),
							'id'   => 'main_image',
							'type' => 'gallery',
						),
					)
				),

https://wordpress.org/plugins/pixtypes/