By clicking on the down arrow, the highlighted menu appears.  There are three options:

1) "Close" - this will close the screen you are on, therefore in this example, Custom Budget Entry; or

2) "Close all" - this will close all open screens, in this example from the Manage Object to Custom Budget Entry; or

3) "Close all but this" - this will close all open screens except for the screen you are on, in this case on the Custom Budget Entry screen will remain open.