Hi @SharePointDev12 ,
Do you want to set all fields on your Edit form to View Mode except one field?
Currently, there is no simple way to achieve your needs. You could only change the DisplayMode property of each data card in your Edit form manually one by one.
As an alternative solution, I agree with @WarrenBelz 's thought almost. Two Edit forms could achieve your needs. You could add another Edit form (connects to same data source as your original Edit form) in your Edit screen, move it at the top of your original Edit form.
Enable single one field data card (which you want to Edit) in your new added Entity form, set the Item property to same formula as that in your original Edit form. Within your Original Edit form, remove the single one field data card (you want to edit), then set the DefaultMode property of the Edit form to following:
FormMode.View
then you could review the field data cards in View mode without changing DisplayMode property of data card one by one.
Best regards,