displaying important/action etc emails in KMail 1.9.10 on TDE 3.5.13.2

Using KMail 1.9.10 on TDE 3.5.13.2 There always used to be a neat little panel on the right of the toolbar that had a drop-down menu where one could choose what to display. That seems no longer to be there: both I and my husband have lost it. So how do I resurrect the panel? Or how do I get access to the emails that I have marked as being important or for action? (Without going through my emails one by one!) Thanks, Lisi