Vertical Split Form?

Is it possible to create a split form where the split is vertical instead of horizontal? The easiest way to describe what I want is to picture a table of US State codes (AK, AL, AR, etc) in a 1:M relationship with addresses of nationwide volunteers. (That's not what I'm actually doing but it's a simple way to visualize the situation.)

I currently have a split form based on the States table with a tablular subform of the volunteers' names and cities inside the main (upper) part of the form. The tabular version of the States table appears in the lower half. Click on one of the records in the tabular part of the States form and the upper part populates properly showing the volunteers from the selected state.

But since there's just one field in the lower half, there's all this wasted space. Plus it looks clumsy and isn't intuitive at all. I'd rather have the tabular (currently lower) half of the split form at the left, and the main form (currently upper) with the selected record and the tabular subform on the right. I can't find a way to do this.