Do I need to ensure ThreadPool threads have returned before exiting main (C++)

Question

I cannot find a straight answer to this. I know that for ordinary threads that you create and control in C++, you must either join or detach them before exiting main. (http://www.cplusplus.com/forum/general/176290/)

But for thread pools (in which the programmer doesn't explicitly manage the threads), specifically with regard to the Win32 ThreadPool API(https://docs.microsoft.com/en-us/windows/win32/procthread/thread-pool-api): Do you have to ensure that no threads in the threadpool are running when the process terminates? And what happens if main exits while a worker thread callback is being executed in the threadpool created in main?

If one of the worker callbacks has an infinite loop, does that change anything?