OmniPlan 4 and dark mode

OmniPlan 4 automatically uses my system setting and for me this is dark mode. Exporting to a PDF seems to use the dark mode settings too which result in a PDF with a dark background. It would be nice to be able to choose the background colour when exporting or provide an option where I can quickly toggle OmniPlan between light and dark mode so that I can quickly switch for export purposes then switch back.