From recent discussion in another thread.
Color selection in inspector of a group seems buggy in v3.0.1, on OsX 10.13.6:
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I find no way to set opacity to zero, when I click on it it directly opens the following panels:
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When I open the panel, it directly applies the color i last selected for another group.
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i cannot “clear” (aka reset to no color) the color i have set, though that dropdown menu item exists on the label “color” in the inspector.