Use the Settings tab to extend a trendline to the left or right.
Access by double-clicking on the Vertical Line or right-clicking on the object and using the Edit "Vertical Line" menu sequence. Select the Settings tab.
- Extend across all subgraphs - Check this setting to have the vertical line extend across every subgraph in the chart window.
Set as Default - Check this setting to use any changes that you made as your default.
Click OK to apply changes or Cancel to exit without changes.