Tab arc in/out

I have noticed this feature is grayed out and I keep expecting it to be usable after all of these updates but no luck. Is there anyway to turn this on as I desperately need it. I cut knife blanks from very expensive sheets of steel and I have had to resort to manually drawing tabs onto the dxf files. I can’t auto tab because starting a cut right on the profile blows out a larger hole then the cut it’s self. This makes the blade undersized by the time It’s removed on the grinder. Thank you - JT