The location of stop button is not convenient: it's located at the center of a dialog box that gets itself centered in the main Logic window. As the Logic main window is usually large, it gets overlapped with other UI windows from other software. This means that the Stop button is often, if not always, hidden by other development windows.
It would be very great to move or better add a "stop" button close to the Logic menu bar or anywhere else it could be made easily reached when several development windows are displayed (... usually the one from which the tested device is started up or debugged).
At least, it could be swapped with the Start button when data acquisition is running.
Better: get rid of boring sys modal dialog boxes, it is awkward, especially on mac OS environment.