Fit to Screen does not work

Glad it’s mostly working well for you!
If you’re using Only Flexible Layouts in Hype and you have your height set to 100%, you will likely hit an issue where the Hype document won’t appear at all. This is because the height of the document is 0 pixels, if no height is set. To fix this, you can set a CSS class on a specific Hype element by filling in a CSS class on the input form: https://forums.tumult.com/uploads/db2156/original/2X/5/57221c860f81aeef1c864f76c3e7933974149763.png

Next, go to your WordPress theme’s CSS, and insert:

.minheight400 { height:400px; }

Another option is to use this script for adjusting the container size based on the layout setup in your Hype document: https://forums.tumult.com/t/creating-a-flexible-tumult-hype-document-within-a-div-with-no-set-height/13224/20

This document ( https://forums.tumult.com/uploads/short-url/k3ZwAMZtKobGAi9ZHSFfO8hutRO.zip ) will help you plan your Hype document responsive settings when embedding your Hype document in a post or page: SizeDetector.zip (278.9 KB)

These suggestions were pulled from this page: https://forums.tumult.com/t/tumult-hype-animations-wordpress-plugin/11074

I thank you so much for your support!!

Solution #1:
Does not work for me, because then the height would always be 400px and is not rezising.

Solution #2:
This was a really hard one to understand for a newbie. But now I got it and it works well! ??