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Every time I use an effect or a modifying function ("Extrude and Bevel" or "Split into grid" for example) I have to check "Preview". I always want preview to be enabled.
Is there a way to get Illustrator to have preview enabled by default?
No, it is not possible.
Note, the Spacebar will toggle the preview option in some dialog windows. (specifically, those without any input fields)
use tab to move focus to the checkmark
Required, but never shown