Size of photo in list

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Hi Formidable,
Thanks for the excellent plugin!

I have a question, I have a dynamic field where I show a photo as a value of an earlier submitted form. The size of the photo is standard thumbnail 150×150.
Where can I change the size of these photo’s? (changing this in the media options in WordPress is not doing the trick)

Thanks in addvance and best ragards,

Martijn