Help with the latest Redactor, removing formatting options
Inside the buttons array, you should only mention formatting.
The actual styles you want to put inside an array with key &quot;formatting&quot;.
{
  &quot;buttons&quot;: [
    &quot;html&quot;,
    &quot;formatting&quot;,
    &quot;bold&quot;,
    &quot;italic&quot;,
    &quot;unorderedlist&quot;,
    &quot;orderedlist&quot;,
    &quot;link&quot;,
    &quot;image&quot;,
    &quot;video&quot;
  ],
  &quot;formatting&quot;: [&quot;p&quot;, &quot;h2&quot;, &quot;h3&quot;, &quot;h4&quot;, &quot;h5&quot;],
  &quot;plugins&quot;: [
    &quot;fullscreen&quot;,
    &quot;video&quot;
  ],
  &quot;linkNewTab&quot;: true,
  &quot;toolbarFixed&quot;: true
}

Reading a bit further in the docs, you could also remove the styles you don't want, instead of stating the ones you do want:
formattingHide: [&quot;blockquote&quot;, &quot;pre&quot;, &quot;h1&quot;]