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In Google Analytics 4 (GA4), once a custom parameter has been registered as a custom dimension or metric, it becomes available to all the events that are recorded in your property, not just the events it was originally associated with. Even though you registered those parameters with specific events, GA4 doesn’t retain any association between the events and the parameters once they’re registered; they’re essentially seen as being applicable to all events from that point forward.
This is why when you click “Updated_Header_Menu_event”, you are seeing not only its own definitions but also the definitions from “Updated_Footer_Menu_event”. Even though “Updated_Header_Menu_event” doesn’t contain those parameters, they are still available to all events once registered in GA4. This behavior might seem confusing but it’s actually by design to provide maximum flexibility in the way you can use custom dimensions or metrics with your events.
