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In Google Analytics 4 (GA4), custom parameters get attached to events to which they are relevant, but can appear within other events too. Essentially, when you generate custom definitions for any parameters in GA4, you’re making these parameters universal and they can appear across different events, even when they’re not directly associated with those events. This is why you’re observing “Updated_Footer_Menu_event” definitions when you click on “Updated_Header_Menu_event”.
So, these custom dimension/definition aren’t technically unrelated to these events, they’re simply universal because they were created as custom definitions in GA4. They may not be relevant but they will continue to appear regardless. This function allows for the cross-analysis of data across different event types which might be useful in certain analytics settings.
