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The type of conic arc depends on the value of the parameter or other constraints that we have used to define it. According to the online help:
Parameter: ratio ranging from 0 to 1 (excluded), this value is used to define a passing point (M in the figure below) and corresponds to the OM distance/OT distance.
If parameter = 0.5, the resulting curve is a parabola
If 0 < parameter < 0.5, the resulting curve is an arc of ellipse,
If 1 > parameter > 0.5, the resulting curve is a hyperbola.
Do you think that we can get a parabolic arc by setting the parameter value > 0.5 and highlighting the default parabolic result option? I don't think so.