expandable Text Box: strip is not dynamic in height.

I already searched the forum, but couldn’t find any solution

I created a expandable “read more” Textbox within a #columnstrip (See Picture). But the strip doesn’t behave dynamic. The height stays the same.

What can I do to make the strip dynamic in its height in the Desktop Version?

By the way, it works for the mobile Version - but not with a picture in the background, this is not dynamic. Is there also a solution to make the picture behave dynamic in height?

Thanks for any advice

Can anybody give me advice with this issue, Thank you