I joined two projects using modules but the added projects class wont show in editor

Both the projects that i joined together show in Visual Studio

309129-annotation-2020-08-04-211231.png

But only one shows in editor

309130-ewfewefew.png

QUESTION why cant i include SendProjBeep header files in MainProjBeep classes

309115-ewfewefewvrgrfferwf.png

SendProjBeep wont show in the editor