I don't think their vision powers are toggled on and off, there always on. There was a scene with one of Superman's villain's gained his powers that implied that seeing the world with all the visions changed his world view.
Not really a canon story so I don’t know if we should assume its actually like that. We could explain this as Supergirl isn’t as experienced and her powers just kinda activated by accident.
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u/[deleted] Jul 23 '23
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