Евгений Вольф

$nav = [
    'items' => Yii::$app->user->isGuest ? '' : (
                    ['label' => 'Главная', 'url' => ['/site/index']] 
                ),
                Yii::$app->user->isGuest ? "" : (
                    ['label' => 'Сотрудники', 'url' => ['/site/about']]),
                
                Yii::$app->user->isGuest ? "" : (
                    ['label' => 'Лиды', 'url' => ['/site/contact']]),
                
                Yii::$app->user->isGuest ? "" : (
                    ['label' => 'Заказы', 'url' => ['/site/contact']]),
                
                Yii::$app->user->isGuest ? "" : (
                    ['label' => 'Настройки', 'url' => ['/site/contact']]),
];

if (Yii::$app->user->isGuest) {
    $nav = [
        'items' => [],
    ];
} else {
    $nav = [
        'items' => [
            ['label' => 'Главная', 'url' => ['/site/index']] ,
            ['label' => 'Сотрудники', 'url' => ['/site/about']],
            ['label' => 'Лиды', 'url' => ['/site/contact']],
            ['label' => 'Заказы', 'url' => ['/site/contact']],
            ['label' => 'Настройки', 'url' => ['/site/contact']],
        ],
    ];
}

{%- block form_widget_simple -%}
    {%- set type = type|default('text') -%}
    {%- if attr.class is not defined -%}
        {%- set attr = attr|merge({'class': 'my-class'}) -%}
    {%- endif -%}
    <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
{%- endblock form_widget_simple -%}

{%- block form_widget_simple -%}
    {%- set type = type|default('text') -%}
    {%- set attr = attr|merge({'class': (attr.class|default ~ ' my-class')|trim}) -%}
    <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
{%- endblock form_widget_simple -%}