Hiding, Encasing, And Contouring Objects - Gerber OMEGA CP Reference Manual

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Creating outlines on multiple shapes
If you attempt to apply the same outline to two shapes, where one is completely inside another
shape, you will have the following result: Positive outlines expand solid shapes and shrink the
inner shapes or text. Negative outlines shrink outer (solid) shapes and expand inner shapes or
text. Corner type applies only to the outlines that expand the shape or text.

Hiding, encasing, and contouring objects

In the Outline dialog box, there are three options that can be turned on to create specialized
design effects.
Hiding the original object
Hide Originals makes the original object disappear, leaving only the outline(s).