In debug mode, the task occurs to put the breakpoint in the module located in another project, say the library of the modules. Now I do it. I put the stop point on the call of the module and in step by step debug mode I go into this procedure. At the same time, the text of the module appears in the central part of the VS, then you can put a stop point in it anywhere. Sometimes I create an empty procedure in the desired module and put the stop point again in the call string in order for the text of the module to appear in the list of open windows VS.