Navigation:  How do I ...? > Appearance > How do I change the line widths used for the coordinate axes and/or the grid?

Line widths used for the coordinate axes (or box around the plot) and for the grid lines may be changed with the Symbol/Line Styles command on the Options menu, or by selecting the Symbol/Line Styles tool.

 

 Symbol/Line Styles tool.

 

You can also select from 4 or 5 discrete line widths by right-clicking anywhere along a curve and selecting "Line Width".

 

 

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