This is a probably an embarasing question as no doubt the answer is blindingly obvious.
I\'ve used Visual Studio for years, but this is the first time I\'ve done any
Starting from Visual Studio 2017 (15.9.4) there is an option:
Tools->Options->Debugging->Automatically close the console
The corresponding fragment from the Visual Studio documentation:
Automatically close the console when debugging stops:
Tells Visual Studio to close the console at the end of a debugging session.