Holy-moly!! that is difficult. Well, a small work around could be to ... until you are ready to render ... make the construct Blackout from the material library ... it makes the tool pure white ... and even though it's still small (or I expect it to be I don't have a 4k monitor) it may be more visible. Another suggestion would be to lower the resolution of your monitor ... for using Poser anyway.

Boni

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"Be Hero to Yourself" -- Peter Tork