Format rules apply to column values and actions. In a Form view, values are shown in input boxes and it is not possible to display actions. Hence, format rules are not applicable.
You might want instead to check Show type columns that can be formatted using format rules and shown in your forms.
I added an icon instead of changing the text color in "Display Name" expression
I think it suffices to that extent !
Thank u @Joseph_Seddik
Well done!
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