Vertical lines are often used to highlight some section of time within a data series.
In Style property dialog it is possible to change the appearance of a Vertical Line:
Can change the color and opacity of the vertical line as well as its thickness and the line style.
Toggles the visibility of the time value of the vertical line on the horizontal axis.
In Coordinates properties dialog you can set precisely the position of the Vertical Line on the time scale by setting the bar number:
Allows for the precise placement of the vertical line using a bar number.
In visibility properties dialog you can switch displaying of a Vertical Line drawing on charts of different timeframes:
It is possible to set an alert to get notified about a series crossed the vertical line on a chart. Use the clock icon in floating drawing toolbar or in right click menu on the drawing itself:
Then select a condition, periodicity and preferable method of notification and press Create:
You could also draw a Vertical Line using Alt+V hotkey: