It took me ages to work out exactly what the Composer Preview field does. Yes, I’ll update 4 - Field Settings!
An issue that jumps out at me is that there are zero clues for the user as to its function or how to use it in the wizard settings.
May I suggest making it consistent with the Create Topic and Send Message actions post Builder?
Call it a ‘Builder’ rather than ‘Template’
Include the same
Show Fieldsbuttons as the Builders