$LorentzIndices

Description

$LorentzIndices is a global variable. If set to True the dimension of LorentzIndex is displayed as an index.

$LorentzIndices = True;

MetricTensor[α, β, Dimension -> n] 
      DiracMatrix[α, Dimension -> n]

% // StandardForm

MTD[α, β] FVD[p, β] GAD[μ] // FCI

% // StandardForm

$LorentzIndices = False;