The theater was set up...
O as a stadium with an oval stage on the floor surrounded by audience on all sides, like a modern football
stadium
with all seats at the same level facing a framed stage with large curtains
as a stadium that went less than 1/2 way around an angled stage higher in the front and lower in the
back
as a kind of stadium with leveled seats going 3/4 around a circular, flat stage

this is a question about greek theaters