Question:
Is the filter to Group Name field on the New Event Team Member page configurable in CRM online?

Answer:
The filter to Group Name field on the New Event Team Member page is not configurable because it is not a real Lookup field.
Salesforce does not allow users to create customized Lookups to the Group table. As it appears to be a Lookup in the UI, it actually saves to a Text field.
Related Documentation:
N/A
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