CKEditor Font Size and Family buttons does not appear
For me, I put the center, left, and right align buttons in my "TOOLBAR CONFIGURATION".  But You also need to add the class attribute to the filter to "Allowed HTML tags" at the bottom of the page.

&lt;p id class&gt; &lt;br&gt; &lt;u&gt; &lt;s&gt; &lt;em&gt; &lt;strong&gt; &lt;cite&gt; &lt;blockquote cite&gt; &lt;code&gt; &lt;ul class type&gt; &lt;ol class start type&gt; &lt;li class&gt; &lt;dl&gt; &lt;dt&gt; &lt;dd&gt; &lt;h2 id&gt; &lt;h3 id&gt; &lt;h4 id&gt; &lt;h5 id&gt; &lt;h6 id&gt; &lt;drupal-entity data-entity-type data-entity-uuid data-entity-embed-display data-entity-embed-display-settings data-align data-caption data-embed-button&gt; &lt;img src alt data-entity-type data-entity-uuid data-align data-caption&gt; &lt;a class href hreflang !href id rel target title&gt; &lt;table&gt; &lt;iframe src frameborder width height scrolling allowfullscreen&gt; &lt;caption&gt; &lt;tbody&gt; &lt;thead&gt; &lt;tfoot&gt; &lt;th&gt; &lt;td&gt; &lt;tr&gt;