Is it possible to center the chart around the last expanded node?
I have tried to use $plumsail.layoutController().getScrollContainer().scrollLeft property but it has some weird number like 48000+ by default. And I do not know how to get the coordinates of the last clicked “+” box.
Looks like I misunderstood your initial questions. Unfortunately there is no API for this. You can contact support@plumsail.com to request this functionality. We don’t have such requests from our customer yet, but you can order Pro Support to add such functionality.