Hi Richard. There is a preference entry for it in the Mac preferences, too, but I see the same result - enabling it does not make the Special Menu (or its commands) available in the Work Environment.
I haven't used this 'show penetration lines' solution in a really long time... ever since Solid Element Operations and improved trimming made it easier to model things properly. For example, way back when, it was easiest to model a chimney during design development as walls simply penetrating a roof ... and this Special Menu command made the roof edges at the penetration visible in elevations / 3D.
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AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB