Lost Changes (UX Column format using simple Expression)

[Jules_Lane]

UX / Format Rules I have a simple rule. Based on a simple expression ([Done]=true), where Done is a column name with values . If this evaluates to true I set the Highlight and text color to green and the text format to bold for a specific column and add a smile icon.

As soon as I define this in or make any changes, it all looks correct in the emulator.

As soon as I hit save the changes seem to be ignored.

What am I missing ?