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AFAIK the tooltip is automatically configured to reflect the Related Action's "description". So the first thing to try (if i'm right) would be to clear out the related action's Description field.
I have description set as empty and it's still showing
If I enter a description, it appends it on to the tooltip
If I make it null or "" , it still shows.
Sorry for the wrong info then - in that case, i think this is most likely hardcoded behavior within Appian.
It might be worth your while to raise it with them as a support case, especially if you can make a use case for needing the ability to turn it off.
No problem, appreciate the response. Thanks Mike, I raised it as a support case.