This function requires the TwbsHelper module to be added. See neilime/twbs-helper-module
Add to the view where the form is used
$this->formCollection()->setElementHelper($this->formRowHorizontal());
$form->prepare();
echo $this->form()->openTag($form);
echo $this->formCollection($form);
echo $this->form()->closeTag();
Replace a view helper in current view
$this->getHelperPluginManager()->setService('formRow', $this->formRowHorizontal());
Format select in bootstrap v3
Add to less-template:
select.form-select {
.form-control
}