Is there any way to search all our constants for constants with a particular value contained in their list of values?
Our options are By name/description, UUID or UI, or by expression.
None search the values of our constants.
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Sadly no.
Back when "by expression" searching was introduced, I had a fleeting moment of hope that it would search constant values too (since otherwise it has nothing to do with constants), but alas.
You could always file for a product enhancement with Appian, I suppose.