There is two ways to "highlight" an area:

You can change the Color of each task. 

or you can filter the time start and finish dates.  

Changing the color of the task:

Double click on task to open on task property for each task > go to color tab

To Filter your start and finish dates in this image you will click next to the start/finish column: a key will appear for you to select dates.

I also have removed the compled task from my project in both these imgaes. You can do this from the View drop down menu.