Where can I add a predicate?

I see folks using predicate conditions. However in RM 5.1, when creating a new rule I can't find the predicate option. Example rule from another user show a toggle for Use Predicate Conditions and an option to define them. How do I add in a predicate condition?
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It's been renamed to 'Required Expression' and is in the same place at the top of the rule page.

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Thank you! Appreciate the quick response

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