How can i see my tasks on the right hand side bar under contacts the same way i do under leads

How can i see my tasks on the right hand side bar under contacts the same way i do under leads

When I am in a Lead I can see my tasks on the right hand side bar so they are quick to view. (it also puts them down at the bottom of the page under 'open activities'

When I am in a Contact it does not put it in the side bar only at the bottom under 'open activies'

How can I make it so that I can see them on the side bar under Accounts and Contacts