public function getListOptionFields()
    {
        // Obtain Field Objects (from parent):
        
        $fields = parent::getListOptionFields();
        
        // Create Field Objects:
        
        $fields->merge([
            FieldSection::create(
                'MasonryOptions',
                $this->fieldLabel('MasonryOptions'),
                [
                    CheckboxField::create(
                        'HorizontalOrder',
                        $this->fieldLabel('HorizontalOrder')
                    )
                ]
            )
        ]);
        
        // Answer Field Objects:
        
        return $fields;
    }