some responder give impression they do not get a clue what it is all about .

when one adds a new file to a project one needs to avoid all the messy output, and concentrate ONLY on this file, until it compiles clean, that how work on complex software goes, it used to be a menu option in VS before 2022 to compile only a single file ( one wich has keyboard focus on), WHERE IS IT NOW!!!???? I expect an official answer from Microsoft, please.