Read in the Help about Virtual Trace, Trace and Reference, etc. It is all there. You will want the Trace & Reference palette open for easiest use - just click the upper left button to turn the reference off.
Cheers,
Karl
AC 28 USA and earlier • macOS Sequoia 15.3, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
One of the forum moderators