Tagging Text in Editor X, Themes

sorry if I am being thick here,
But…
In the old WIX editor


In one text paragraph:
I could select the text and add multiple tags (H1, H2, p)

In the new X Editor
In one text paragraph:


I seem to only be able to use one tag per paragraph. Even if I select the text backward which usually allows you to do a span tag.

What am I missing?
If this is the new way of formatting text. How can we accurately and consistently preserve vertical space the Heading tags and paragraph text?

Many thanks,
Sylvia