red herring

A Red Herring is a misleading or distracting element that pulls attention away from what actually matters. In UX, it can be accidental such as a design element that looks like it does the thing but doesn’t, something that distracts users from their primary goal or leads them toward the wrong conclusion. But it can also be intentional, such as a deliberate distraction used to test attention or a research question to validate that users don't rush through the study.