$FeynArtsDirectory specifies the location of FeynArts.
$FeynArtsDirectory
Overview, $FeynCalcDirectory.
/home/vs/.Mathematica/Applications/FeynCalc/FeynArts\text{/home/vs/.Mathematica/Applications/FeynCalc/FeynArts}/home/vs/.Mathematica/Applications/FeynCalc/FeynArts