Select an email from your inbox, while having the “Contact Details” column visible. Then select one or multiple emails inside the Contact Details column. Press delete.
Because the emails in the Contact Details column are selected and show with the active color, I would expect that those emails are deleted.
eM Client does NOT deleted the highlighted emails in Contact Details, but deletes the one selected email in the main list. This entry is not displayed as highlighted/active. This is very unexpected.