"Serial Wire Viewer" no output from printf() or ITM_SendChar() visable

Currently I am using the example-application for Audio Weaver, which I am using with an STM32F407 board.
When I am using printf() or ITM_SendChar(), the output is not visable with the "Serial Wire Viewer" of the 'STM32 ST-Link Utility', which normally would work perfectly with other STM32-based applications.

I am using a system clock of 168 Mhz and a Stimulus of '0' inside the 'STM32 ST-Link Utility' , but also tried other common settings like Stimulus 'all' without success.
Menu-item in ST-Link Utility: ST-LINK->printf for SWO viewer.
Because ITM_SendChar() is used to redirect the output of printf() in your "AWECore ST_EVAL_CortexM4 Release-8.B.5.1_ST_Eval_build61" application,
I guess it worked for you. It is defined in "BoardSetup.c" fputc(), but to be sure, as explained I also used ITM_SendChar() directly inside "Platform.c" like this:

...       if (g_bBlinkLED4ForBoardAlive)
          {
            static INT32 nLoopCount = 0;

            // Blink LED4 to show board is alive
            nLoopCount++;

            if (nLoopCount == 500000)
            {
                // Indicate board running by toggling LED4
                HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_12);         // MB 20200828 chaned PIN12 to active by setting the bool-value
                printf("hi\n");
                ITM_SendChar('x');
                nLoopCount = 0;
            }
        }

    }   // End while

So, could you please explain the needed settings to make this work?

Thanks a lot!