Lets you change the allowed CPT's that show the 'Remove from Menu' or 'Remove from My Account' checkboxes.

wecr_allowed_meta_post_types.php

/**
 * Changes the post types that show the 'remove from menu' and 'remove from my account' checkboxes in the WordPress admin
 *
 * @param array         $types          required            The existing allowed CPTs
 * @return array        $types                              Our modified array of CPTs
 */
function change_allowed( $types ){
	$types[] = 'forum'; // change this to your registered custom post type name
	return $types;
}
add_filter( 'wecr_allowed_meta_post_types', 'change_allowed' );