The indicator does not vacuum the indicator from the chart, it counts it inside itself. You need to synchronize the parameters.
If there is only one trend line or horizontal line on the chart, you don't have to come up with a name for it.
If there are many different sticks on the graph, then you need to come up with a unique name.
First, you need to apply a line, then load the indicator. He understands the direction himself.
