Hello!
(Form new extent: 300 @ 400) edit" It didn't work for me in Squeak 3.8 (on my Macintosh).
In system browser you can open class Form and in editing category along with #edit there is #morphEdit method. It is work in Morphic.
At least on my computer this work: (Form extent: 200@200 depth: 8) morphEdit
Good luck. Alexej.
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