In the User interaction node, you can determine what the user is allowed to do when he doesn’t have the “Change layout” right but he does have the “Interact with views” right.

With the right "Interact with views" the user may zoom and move the X-axis. If the "Allow changing signals ..." option is enabled, the user additionally has the right to change the signals in the trend graph. The user can then drag & drop signals from the signal tree to the trend graph. He can also remove signals and rearrange the signals.

When the option is not enabled then the signals are fixed.

This allows you to configure fixed trend graphs and “free” trend graphs that the user can change.