Running a program in the debugger will put KDevelop in a different mode: it will replace all the "Tool" buttons on the perimeter of the main window by ones that are appropriate for debugging, rather than for editing. You can see which of the mode you are in by looking at the top right of the window: there are tabs named Review, Debug, and Code; clicking on them allows you to switch back and forth between the three modes; each mode has a set of tool views of its own, which you can configure in the same way as we configured the Code tools in the section Tools and views.
