So after interacting with an NPC I want to eliminate the dialogue, to not repeat ever again is it possible? I have problems with understanding the visual nodes in action list editor...Help!!!
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By "Dialogue System", are you referring to an individual Conversation dialogue option, or the NPC's Hotspot Interaction itself?
The Hotspot: Change Interaction Action can be used to disable a Hotspot Interaction. You can run this at the end of your NPC's Interaction ActionList to prevent it from re-running the next time they are interacted with.
If you want to replace this with an alternative Interaction, you can use another of this Action to enable a separate Interaction at the same time.