Qt Creator has two modes of running your app: "run" and "debug". I think you may be confused as to what they mean:
- Run: launch the program, exactly the same as double-clicking on the executable.
- Debug: launch the debugger, attach it to the executable, and run the executable through the debugger. This records all steps (function calls etc.) your program has, including breakpoints.
In short: when you need to figure out an internal value during program execution and/or have set breakpoints, use Debug. For anything else, just run it, which is a lot faster.