On the other widgets you can select the widget and choose which components you want to include. If you hover over the component, like the Title, you can choose how you want to justify the text on the widget. You cannot do that on the Click to Reveal, hovering over the component reveals nothing and so the title is permanently left justified. You can center the text, but its still to the left side of the widget. This is the Default design. The other designs do have the title centered, but you should just be able to do it yourself as users may not want to use the other designs just to have a centered title.