Hi Martin,
I’m Anna from the Editor X Product Team.
If I understand your question correctly - to add a dynamic page you need to turn Dev Mode on and then open the pages panel.
You will have the option there:
Hope this helps!
If you were referring to something else, please provide some more details as to what you are trying to achieve and we will be happy to help.
Thanks, and please feel to reach out again with any more questions or feedback.
Anna