Well, if you use the drop pred in the PrintScreen you have shared. You should be able to rip it off from the DB. It works fine on my end tho. If it isn’t working at your side, maybe something is reintroducing the schema every time.
The Upsert Block isn’t useful in this context. It should be used for values, not to drop predicates in the cluster itself.
If you are talking about to “no longer appear at the Cluster Panel”. Well, that’s a different thing. It should disappear from there in a few hours. If you notice that it took a day or more to disappear, please open an issue cuz that would be a bug.