Add submenu
You can split tab to several submenus
Submenus generated from tab fields. Add submenu parameter to field and tab will become splitted with addition menus

Example usage:
'tab_1' => array(
   //----And its name obviously
   'name' => esc_html__( 'Tab 1', 'my-domain' ),
   'label' => esc_html__( 'Tab 1 Label ', 'my-domain' ),
   'icon' => 'fa fa-camera',
   'fields' => array(
      //field key and its settings. Full info about fields read in documentation.
      'field' => array(
         'type' => 'text',
         'label' => esc_html__( 'Text 1', 'my-domain' ),
         'submenu' => esc_html__( 'Submenu 1', 'my-domain' ),
      ),
      'field_2' => array(
         'type' => 'text',
         'label' => esc_html__( 'Text 2', 'my-domain' ),
         'submenu' => esc_html__( 'Submenu 2', 'my-domain' ),
      ),
      'field_3' => array(
         'type' => 'text',
         'label' => esc_html__( 'Text 3', 'my-domain' ),
         'submenu' => esc_html__( 'Submenu 3', 'my-domain' ),
      ),
      'field_4' => array(
         'type' => 'text',
         'label' => esc_html__( 'Text 4', 'my-domain' ),
         'submenu' => esc_html__( 'Submenu 4', 'my-domain' ),
      ),
   )
),