Hidden Fill Colour... Setting the Hidden Line Fill Colour for 2D and 3D Elements
Hidden Fill Colour ... Setting the hidden-line fill colour for 2d and 3d elements

By default 2D and 3D elements are filled with the current background colour,
whatever that may be.
However with the popup next to you may choose any other colour. The button shows the current colour (here "B'Ground").
The following three images demonstrate how the fill colour can be modified:
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(1) This image shows the default behaviour: Black background with element infill in the background colour. |
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The default infill is still background colour, so elements are also filled in with grey. |
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The hidden-line infill colour has been set explicitly to black. |
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