By default, the Flipbook format is vertically aligned to the top of the browser.
You may be able to do vertically center Flipbook (assuming no Desktop Scaling is applied) by attaching the following code as a .css
file in the Resources
section of the in5 dialog (how to attach resources
If Desktop Scaling is applied, you can use the following CSS (instead of the code above):
transform-origin:0 50% 0 !important;
Live discussion on this page:
To vertically center a Slider see: