space between clefs

I seem to be able to adjust the vertical space between systems using global settings, but I can't seem to find a way to increase the space between the treble and bass clef in a single system in a typical piano score. I often have multiple voices going, and the up stems toward the top of the bass clef run into the down stems at the bottom of the treble clef. In other software I just expanded the vertical space of each system when needed to reduce the confusion. Is there something I am missing? I was hoping I could simply drag the bass clef down the page a little bit but that does not seem to be an option.

Thanks in advance.