FCGetDiracGammaScheme[]
shows the currently used scheme for handling Dirac matrices in dimensions.
Overview, FCSetDiracGammaScheme, DiracTrace.
["BMHV"]
FCSetDiracGammaScheme
[]
FCGetDiracGammaScheme
% // FullForm
["NDR"]
FCSetDiracGammaScheme
[]
FCGetDiracGammaScheme
% // FullForm