I found it….View/On-screen View Options/Highlight Source Marker…..
Another question - Can we change the highlight color?
Lilian Seow
LEED AP | cSBA | CAPM | PMP
Interior-Architecture and BIM Management
AC20 USA | 27- macOS 10.14.6| 4 GHz Intel Core i7| 32 GB RAM | Archicad-user since 1994!