Print preview not correct

Hello everyone,

i have built a dashboard that i would like to print on A4 (landscape).

The dashboard shows different diagrams, tables per row side by side or alone.

On the monitor it looks good.
When printing the diagrams are displayed not next to each other but below each other. (Why is this?).

Can I set my dashboard to A4 (landscape) so that I can see how much space I have left when printing? and maybe I have to add an empty target for a sheet change?

Link sharing for external customers is not an option !

I have tried different internet browsers, with all the same result.

Image monitor:

Image Print:

Greetings from Germany