Not available with Soft Edges.
Expander 
increases the width of lines or areas in the picture.
Shortcut
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Paint Window Control Panel; Tools:
Expand the Width of Lines in a Picture
-
Click the Expander
icon. The Expander pointer
appears. -
Zoom in on a line that you want to expand.
-
Click on the line to expand it. All lines using that color in the picture will be expanded.
Click again to expand the lines further.