Changes

You can see "Stack Frame" name on the top screen is changed to main\omp\1

On the Threads window, you can see "main thread" and other new three thread which same as default usable thread number 4 (it is printed in the serial region as "omp_get_max_threads()"). after hitting 4 times (you can see the count on the breakpoint Window), the step goes to the next region.