Fixed logo, transparent header background – no toggle bar

Hi I am using full frame pro. When Header Toggle is pressed, then logo appears and logo background is transparent. That's the way I like the homepage to work. But I do not like that Toggle needs to be actively pressed. Toggle bar shall be disabled and Logo shall be present all the time. I have now disabled the Header Toggle (Fixed Header Top Option) but what happens is that now the Logo appears permanently, but with solid background. I there a way to make the background transparent again? Thanks for supporting me. Best regards from Lucerne / Switzerland. Stefan