Hidden conditional logic does not work

Hello, I bought the plugin about 4 days ago, but I am facing a lot of problems in order to prepare my form. I am trying to create a form where it will be a dropdown list with “Notebook BRANDS” And according to the choice, a new list appears with the respective models of the selected brand. But when I put it to conditional logic to get hidden and as the response comes up, it does not work. Kindly hope to have brief help.
<pre id=”tw-target-text” class=”tw-data-text tw-ta tw-text-small” dir=”ltr” data-placeholder=”Tradução” data-fulltext=””><span lang=”en”>(Note: sorry for English)</span>