Select the stencil(s) you wish to adjust styles for.
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Locate the Style options in the toolbar or the right-hand sidebar.
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Select the desired stencil fill using the Fill dropdown control.
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A white label background can be selected where fills impact readability for text and numbering.
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Use the Border controls to give the selected stencil(s) a solid, dashed, dotted, or invisible border.
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Use the Thickness field to change the border thickness by either typing a number or clicking the up/down arrows.