While debugging, you can make Design Studio stop at a specific step in the robot by setting a breakpoint on that step. The easiest way to do this is to right-click on the step in the Robot View and select "Toggle Breakpoint" in the pop-up menu. The breakpoint will be indicated by a small icon in the step.
When Design Studio reaches a breakpoint during debugging, it will stop, unless you have chosen not to stop at breakpoints in the "Stop When" panel. You can resume the debugging by clicking the icon.
You can remove the breakpoint from a step by right-clicking on it and selecting "Toggle Breakpoints". If you select one or more steps, you can remove all breakpoints of these steps by selecting "Remove Breakpoints". You can also remove all breakpoints in the robot by clicking the icon.