Disable Project Post Type in Divi Theme.

functions.php

/**
 * Remove portfolio post type from theme
 *
 * @param array $args post type array.
 */
function cpdivi_et_project_posttype_args( $args ) {
	return array_merge(
		$args,
		array(
			'public'              => false,
			'exclude_from_search' => false,
			'publicly_queryable'  => false,
			'show_in_nav_menus'   => false,
			'show_ui'             => false,
		)
	);
}
add_filter( 'et_project_posttype_args', 'cpdivi_et_project_posttype_args', 10, 1 );