More control over font, background color, etc
We have a pretty extensive amount of customization options for our chart. Including background color, text color, sizing, background images, side by side images along with your chart, and six or so different fonts. We go over a lot of these and how they work in our User Guide here: https://www.polleverywhere.com/guides/presenter/getting-started#customizing-your-poll
Is there anything in particular that you are looking for in customizing the slide?
Bruce Matthews commented
Expand the number of visual settings and transitions.