There have been several posts recently from people saying that the Rules tab in their designer disapeared. This was a problem caused by a piece of code that got released to early. There is now an official Blog post that discusses the future roadmap for the Rules Tab. Starting today it should be an optional feature that will only appear in new apps if you enable it. It will continue to appear in existing apps. But the key in the article is that in addition to being optional going forward it has also been deprecated. There are other ways to accomplish what Rules do and you should explore those in the future. Here's the official Blog post:
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Hi @Pstork1, thank you for the notification.
Can you please advise how "expressions" can replace the rules feature? In my app I used rules for two things:
Is my only alternative to duplicate that logic in two places? E.g. keep one copy of the logic in the button's DisplayMode property, and another copy in the field's Fill property?
The logic is normally stored somewhere else and is used to set a variable value. Then If statements in the DisplayMode, Fill, and perhaps visibility of a label with handle the error checking. That's essentially what the rules were doing. They were just packaged differently.