$main_config = [
    'title' => __( 'Main Page', 'igm-reviews' ),
    'id' => 'main-page',
    'tab_style' => 'box',
    'tab_default_active' => 'tab_main',
    'tabs' => [
        'tab_main' => [
            'label' => 'Activate TABS',
            'icon' => 'admin-home',
        ],
        'tab_1' => [
            'label' => 'TAB 1',
            'icon' => '',
        ],
        'tab_2' => [
            'label' => 'TAB 2',
            'icon' => '',
        ]
    ],
    'fields' => [
        [
            'tab' => 'tab_main',
            'name' => __( 'Activate Tab 1?', 'textdomain' ),
            'id' => 'tab_1',
            'type' => 'post',
            'field_type' => 'switch',
        ],
        [

            'tab' => 'tab_main',
            'name' => __( 'Activate Tab 2?', 'textdomain' ),
            'id' => 'tab_2',
            'type' => 'post',
            'field_type' => 'switch'
        ],

    ]
];

// Then after saving tabs you check if switch are activated and add configuration array to main array

$tab_1 = [
    'tab' => 'tab_1',
    'name' => __( 'Input Title', 'textdomain' ),
    'id' => 'title',
    'type' => 'post',
    'field_type' => 'text',
];

$tab_2 = [

    'tab' => 'tab_2',
    'name' => __( 'Input Name', 'textdomain' ),
    'id' => 'name',
    'type' => 'post',
    'field_type' => 'text',
];


// Read option of main tab saved
$switch = get_option();
// then check and add tabs
if ( $switch( 'tab_1' ) == 'on' ) {
    $main_array['fields'][] = $tab_1;
}



return $main_array;