Mail - Headings in the flagged mail section

The emails that I have flagged can later be displayed under the sorting choice Flagged. But in this view, I can not see any column choices, just a few fixed columns without headings, I am guessing they are "from", "subject", mailbox, mail size, date and time

In order to quicker find what you are looking for, I would like to see column headings and also be able to choose more columns, like for example "To".

Any options available?