I can apply conditional formatting to a field in a portal in 15. In 16, conditional formatting does not appear as an option by right-clicking or using the Format menu. Only 'Object Style' is available. The file is hosted on FMS 16 Windows; clients are Mac's.
If I delete the field and replace it with a new iteration of the same field, I might be able to apply formatting. But that ability disappears once I save the change, go into Browse mode, and return to Layout mode. Opening the same file in 15, CF is still available as an option.
This appears to be a bug.