When you start a debugging session the IDE opens some debugging windows by default. In addition to the main Debugging window in the left pane of the IDE, other debugger windows open as tabs below the editor. You can open any debugger window by choosing Window > Debugging > window-name (for example, Window > Debugging > Breakpoints).
In the debugger tabs, information is organized into lists. Each list item represents a single object. Each column represents a property of the object. Data displayed in blue underlined text is linked to the source code.
Each debugger window displays a variety of icons to relay information about the object. For example, the Breakpoints window uses a small red square to indicate a breakpoint set on a line. Some windows also include a node expansion control in the left column. Clicking this control expands and collapses the object.
Some elements of a window's list have editable properties, such as the value property of a variable in the Variables window. If you select a property and the property has a white background you can edit the property. A selected property with a gray background cannot be edited.
You can move a column by dragging the column header.
You can click 
(to the right of the column titles)
to open a dialog box that enables you to choose the columns that are displayed.
You can right-click an item in the list to open a pop-up menu where you can choose to perform actions on that item
and modify how the items are displayed in the tab.