Under the diagram there is a "budget" column where you can see Income budget and Expenses budget for a certain period of time.
What is that Income Budget box?
It shows you the total income for all categories of your earnings during the reporting period.
Expenses Budget box works the same way.
You can view the budget for any other period by clicking "Your period".
On the left you'll see the budget for the particular unit time. On the right (in colour) the budget for a certain week/day/quarter etc is shown.