'#type' => 'checkbox',
'#title' => $this->t('Limit list to selected items'),
'#description' => $this->t('If checked, the only items presented to the user will be the ones selected here.'),
'#type' => 'checkbox',
'#title' => $this->t('Limit list to selected items'),
'#description' => $this->t('If checked, the only items presented to the user will be the ones selected here.'),