By clicking on the 3 dots on the top right. Then select DELETE
An issue with rights maybe ?
That sounds like a permission issue. Can you navigate to Project Settings > Access?
(here)
Problem solved : after an update ( ?) the "Trusted" people have been granted the 3 free license for Product Discovery . I lost my access right and became only " a contributor" even it was not reflected in my role registered on Jira Product Discovery
Oh wow, now that makes sense!
That's when you moved out of the beta edition