src/Generic/GenericItemView.php
protected function setTitle()
    {
        $settings = HtmlPageSettings::singleton();
        $settings->pageTitle = $this->model->restModel->isNewRecord()
            ? 'New ' . $this->getModelDisplayName()
            : $this->model->restModel->getLabel();
    }
protected function setTitle()
    {
        $settings = HtmlPageSettings::singleton();
        $settings->pageTitle = $this->model->restModel->isNewRecord()
            ? 'New ' . $this->getModelDisplayName()
            : $this->model->restModel->getLabel();
    }
Should configure the HtmlPageSettings::pageTitle property