Explain various options available to a user to change the shape outline of a chart element to improve its visual appearance.

Options available to change shape outline are:  To use a different outline colour, under the theme colours or standard colours, click the colour to use.  To remove the outline colour from the selected chart element, click No Outline. If the selected element is a line, the line will no longer be visible on the chart.  To use an outline colour that is not available under theme colours or standard colours click more outline colours. In the colours dialog box, specify the colour that to use on the standard or custom tab, and then click OK. Custom outline colours are added under Recent colours can be used again.  To change the weight (thickness) of a line or border, click weight option and then select the line that we wish to use. For additional line style or border style options click on more lines and then click the line style or border style options.  To use broken line (dash - dash) or border, click Dashes and then click the dash type to use. For additional dash type options, click on more lines and then click the selected dash.  To add arrow to lines, click Arrows and then click the arrow style for borders cannot be used. For additional arrow style or border style options, click more Arrows and then click the arrow setting.