The GetScreenAttr() autodoc has this line in the section that lists tags for GetScreenAttr():
SA_Quiet - (BOOL) see ShowTitle().
That gives the false impression that SA_Quiet contains the ShowTitle status. The same line appears in the SetScreenAttr() autodoc. I think that line should be replaced with:
SA_Quiet - (BOOL)
SA_ShowTitle - (BOOL) see ShowTitle()
I tested using GetScreenAttr() with the SA_ShowTitle tag and it returns the correct ShowTitle setting.