How do you change the logic type for a decision node in a DMN model

In Process Automation Manager, when you create DMN model and create a Decision or BKM node, you select from a set of logic types (Literal expression, Context, etc.) but having once selected a logic type, I can't figure out how to change it. For example, I may have embedded a decision table in a decision node, but later realize I can simplify by using a literal.

If I change my mind, it seems that the only way is to delete the Decision (or BKM) and start over.