Difference between Design and preview mode

Hi everyone, I have a problem and hope someone can help. I see the interface of my lectures when designing and when previewing there is a difference as shown in the image below. I was quite confused because I had to preview so many times to see if the layout of the lecture was correct or not. Has anyone encountered this situation before. Hope everyone will help. Thank you very much

Discussion (3)

Ohhhh ... I didn't even notice it. Thanks, @clammers, for clarifying.

Preview is not a perfect thing. I always use F9 (which previews the current page in a browser) to check placement.

I don't see a difference?

Are you referring to the dropdown overlapping the text? I think this is something we all experience. There are a lot of quirks in publishing with objects slightly shifting. I don't know of a fix other than to adjust the Lectora file after looking and the published course.