With the latest release of our Live Support Software solutions we have improved the (Auto) Engage feature quite a bit.
You will now be able to set the position of the (auto) engage plus the animation and all the field options are back in working order.
You will also be able to center the message no matter what screen size. Use following css code in the widget area.
left:50%;top:50%;transform: translate(-50%, -50%);
How to use the whole float and css within your widget can be found in this FAQ article.