Nav to C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\ItemTemplates\CSharp\Code\1033
Open Class, or Interface directory
Modify Class.cs or Interface.cs with preferred template
Nav to C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\ItemTemplates\CSharp\Code\1033
Open Class, or Interface directory
Modify Class.cs or Interface.cs with preferred template