WOW! Thanks! Found it! Finally, I was able to change the unit to Bytes.

That /!\ (attention) icon is really small, while all others are "normal" (middle) size - this has effectively hidden that part from my vision so far. Besides "Profieinstellungen" is not the right translation of "Advanced Settings" to german - I would expect it to be "Erweiterte Einstellungen" instead...You might consider changing both icon size and translation to avoid such confusion by people like me.