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