I cannot seem to conditionally hide a button on a form (or on the ribbon) based on the value of a SharePoint list property? I tried "expression" in the drop downs in button configuration but they seem to have no affect. (If I specify "No" in the same drop downs, it does work, so I think I'm changing the right configuration option). I can hide the button using a form rule (using the same syntax as I tried in "expression"), but the form rule does not seem to control the ribbon (button function is still visible and active on the ribbon).
How do you conditionally hide a button?
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