Astra_Meta_Boxes::register_meta_settings()

		public function register_meta_settings() {
			register_post_meta(
				'', // Pass an empty string to register the meta key across all existing post types.
				'site-sidebar-layout',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'site-content-layout',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'ast-main-header-display',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'ast-hfb-above-header-display',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'ast-hfb-mobile-header-display',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'site-post-title',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'ast-breadcrumbs-content',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'ast-featured-img',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'footer-sml-layout',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'theme-transparent-header-meta',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'adv-header-id-meta',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
			register_post_meta(
				'',
				'stick-header-meta',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);

			register_post_meta(
				'',
				'header-above-stick-meta',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);

			register_post_meta(
				'',
				'header-main-stick-meta',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);

			register_post_meta(
				'',
				'header-below-stick-meta',
				array(
					'show_in_rest'  => true,
					'single'        => true,
					'type'          => 'string',
					'auth_callback' => '__return_true',
				)
			);
		}