To open the Public Parameters Manager, you need to click the button on the toolbar.
This manager provides a list of all Public nodes for this GrowFX object.
The light toogle on the left turns the Public node on or off.
The eye toogle on the right shows or hides a parameter on the GrowFX command (main) panel. This is equivalent to the Show on Command Panel option in the Public node settings.
The order of the parameters on the GrowFX command panel corresponds to this list. So, you can drag the parameters in this list to sort them on the command panel.