@Beau Cameron I am also having the same issue as the OP.

 

Yes, I went into Power Apps but did not save anything (or at least that is what I thought). Now, the form is way too wide and I cannot see any way to correct this. Unlike the OP, there is no custom JSON showing within the form in Lists.

 

How do I revert the form to the default size? Any advice you can provide would be appreciated.

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