'Wagtail RichTextField - Make admin edit field wider/taller and allow resizing

I recently came across a setting that changes the RichTextField in Wagtail admin to be "full size", ie it was wider and taller, and it maybe even allowed the user to resize the field (not sure about that).

I cannot recall what that setting was or where it was used. I believe it was a settings.py feature but I am not having any luck finding it.

How can I enable the "full size" Wagtail RichTextField?



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