Hi Jiri
Thank you for your answer. I tried this out, but it seems that it is not working for me. I tried this out, but there was acompilation error that LED_B_PIN is undeclared. Then I checked out the "pin_mux.h" file and I also included it in the source file. But the content of this file does not shows something like _PORT or _PIN.
Only in the comment part at the top, there is my choosen name listed. But no Source Code is generated with that name (see attached pictures):

The yellow marked part includes a long comment section with the settings. There I could find the followed lines:

Maybe there is an option I have to set that this is working correctly?