How to set reference line visible or invisible for different expression in group?

[Anonymous]

For example, I have a line chart with 4 expressions in a group. I want to set reference line for 2 expressions of them. When I turn to these 2 expressions, reference line could be visible.

[Gysbert_Wassenaar]

That's not possible with an expression group. If you're using QV11 you can use the conditional option to show/hide expressions. For example using a variable. The variable can also be used to show/hide the reference line by changing the alpha value of the line color. See attached example.