Adding the Sales Notes field to the layout

Adding the Sales Notes field to the layout

When I edit the fields to shwo on my Leads tab I can see all the other fields e.g Lead Source etc but the one I really need to see - the Notes field does not show in the 'edit Tabular View' so I can't see it at a glance on the client Tab View - I'm very new to this so please excuse my very rough terminology!
If you see the image I show then that hopefully will explain the question I am asking - I am sure I'm missing a trick here!
Manyt hanks all who may pay attention to this in advance.