custom post listing table changing ( wp )

/*Adding table titles and unset default titles*/

add_filter('manage_waitlist_posts_columns' , 'add_waitlist_columns');
 
function add_waitlist_columns($columns) {
    unset($columns['author']);
    unset($columns['seodesc']); //unset fields 
	unset($columns['seotitle']);
	unset($columns['seokeywords']);
	unset($columns['title']);
	unset($columns['date']);


    return array_merge($columns,
          array(
          	'name' =>  __( 'Name', 'trans' ), 
          	'wpcf-waitlist-email' =>  __( 'Email', 'trans' ), 
          	'wpcf-courses' => __( 'Courses', 'trans' ),
          	'date' => __( 'Date', 'trans' )
          	)
          	);
}
 


/*Adding table field values*/

add_action('manage_waitlist_posts_custom_column' , 'waitlist_custom_columns', 10, 2 );
 
function waitlist_custom_columns( $column, $post_id ) {
 global $post;
    switch ( $column ) {
 
    case 'name' :

    echo get_the_title($post_id);
        
        break;  

    case 'date' :

    echo get_the_date($post_id);
        
        break; 

    case 'wpcf-waitlist-email' :

    echo get_post_meta($post_id, 'wpcf-waitlist-email', true);
        
        break;
    

    case 'wpcf-courses' :
    	echo get_post_meta($post_id, 'wpcf-courses', true);
        break;
    }
}

/*remove actions under first column*/

add_filter( 'post_row_actions', 'remove_row_actions', 10, 1 );
function remove_row_actions( $actions )
{
    if( get_post_type() === 'waitlist' )
        unset( $actions['edit'] );
        unset( $actions['view'] );
        unset( $actions['trash'] );
        unset( $actions['inline hide-if-no-js'] );
    return $actions;
}
/*remove bulk action Edit*/
  add_filter( 'bulk_actions-edit-waitlist', 'my_custom_bulk_actions' );
    function my_custom_bulk_actions( $actions ){
        unset( $actions[ 'edit' ] );
        return $actions;
    }
    
/*remove submenu of custom post type*/  
    
add_action( 'admin_init', 'remove_waitlist_submenu' );

function remove_waitlist_submenu()
{
    global $submenu;
    unset(
        $submenu['edit.php?post_type=waitlist'][5], 
        $submenu['edit.php?post_type=waitlist'][10] 
    );
}