"A-Rotations Enabled" tells Mach that the toolpath is of a rotary type for visual display purposes.
You must select this and the correct "Axis of Rotation" for the display to correctly represent the rotary toolpath..
Note; you must also set the "Rotation Radius" DRO to represent the distance that the Z axis origin is offset from the centre of rotation. Or the displayed toolpath will be out of whack.
Also note; only A axis toolpaths will display. Not B or C.
Greolt