Hi Jaume! We are looking to improve this, but currently, you would need to reach out to support to transfer ownership. Please open a ticket with them here, and they should be able to help you do that: https://mixpanel.com/contact-us/support/
Gotcha! I would recommend clicking on “View in Insights,” and inputting the specific event you want to see. Curious if that helps or would it be better to have the search capability in the activity feed