To remove default dashboard items and add quick draft widget for custom post type

You can remove the Screen Options with the ‘screen_options_show_screen’ filter.

function myplugin_disable_screen_options( $show_screen ) {
    // Logic to allow admins to still access the menu
    if ( current_user_can( 'manage_options' ) ) {
        return $show_screen;
    }
    return false;
}
add_filter( 'screen_options_show_screen', 'myplugin_disable_screen_options' );