Set the formatting options for the selected line or the line that you want to draw. You can also add arrowheads to a line, or change chart symbols.
Enter the transparency of the line, where 100% corresponds to completely transparent and 0% to completely opaque.
The Line tab of the Data Series dialog is only available if you select an XY Chart type.
Set the options for the data point symbols in your chart.
Select the symbol style that you want to use in your chart. If you select Automatic, LibreOffice uses the default symbols for the selected chart type.
Enter a width for the symbol.
Enter a height for the symbol.
Maintains the proportions of the symbol when you enter a new height or width value.
You can add arrowheads to one end, or both ends of the selected line. To add a custom arrow style to the list, select the arrow in your document, and then click on the Arrow Styles tab of this dialog.
Select the arrowhead that you want to apply to the selected line.
Enter a width for the arrowhead.
Places the center of the arrowhead(s) on the endpoint(s) of the selected line.
Automatically updates both arrowhead settings when you enter a different width, select a different arrowhead style,or center an arrowhead.
Corner and cap styles
Select the shape to be used at the corners of the line. In case of a small angle between lines, a mitered shape is replaced with a beveled shape.
Select the style of the line end caps. The caps are added to inner dashes as well.