E5 module, use of SWO (reallocation DBG3)

Hi, I am using an E5 module, and using the Mini as a development platform.
I see that GPIO ports are assigned for DBG pins 1-4. DBG3 is on PB3 which is also the SWO pin for the MCU.
I have changed the pin assignment to use it as SWO. However I cannot find anywhere that uses the DBG3 GPIO and would like to check where the DBG3 GPIO is used and under what circumstances?

Is using the SWO pin Ok on this module when running the Seeed-Studio/LoRaWan-E5-Node project?