When your selection from the Tree Navigator contains more than one point, then for all points with the same units, the engineering chart will show a plot line on a single Y-axis.

To override this feature, open the Show/Hide Options menu and choose the Split Axes option.

If the chart does not automatically update, click the Refresh icon.

Now, we now have a Y-axis for each point. Notice that the default is to show the units on the Y-axis labels. When we split them, the point names are used on the labels. Each of the Y-axes can be scaled independently if required.

When we have a selection of points with different units, the chart will initially show with a Y-axis for each unit. All functionality described for single point charts, is also available for multiple points where appropriate.