SharePoint List Form Header

SG523 Disregard my last answer. The fact that [$Closed] is a calculated column changes everything. Calculated columns are not available in custom form formatting since they are only calculated when the record is saved.

To make this work, you need to use the formula that is used in the calculated column in the formatting json. For example, if the [$Closed] column calculation is

IF([Status] = "Closed", "Yes","No")

Then use the same formula in the formatting json like this

"iconName": "=if([$Status]=='Closed','BoxCheckmarkSolid','BoxMultiplySolid')",

Hopefully this will fix the problem!

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