I have some issues with markdown editor in Beta1 of DT4.
It will be hard to explain it by writing, that why I recorded videos showing the issue.
I was not able to put the videos on this port. I uploaded them in the link bellow: http://u.pc.cd/OrEitalK
Important:
I did try the same actions on DT3, it is working fine.
Thanks for the screencasts.
Is this on macOS Sequoia?
PS: The window with the sidebars on the left is a main window. A document opened on its own is in a document window. Just so you know the official terms.