Array in HFSS
The scan angle is just a quick way HFSS offers to shift a beam from normal (say for broadside) to a different angle. Behind the scenes, HFSS just takes your scan angle input in spherical coords, and applies a phase shift for each isotropic radiator into the discrete fourier transform to create the array factor that will be multiplied by the single element pattern.
For normal equal phase excitation of the sources, just leave the scan angle to zero in phi and theta or you can equally set the differential phase shifts to zero along the U,V Directions.
I hope this helps!