To ensure that the player can navigate these UIs, by default the UIs will check if the scene has an EventSystem. If it doesn't, it will create a default one.
If you want to disable this behavior -- for example, if some other script instantiates an EventSystem at runtime -- use these steps:
1. Inspect your dialogue UI's Standard Dialogue UI component. UNtick "Add EventSystem If Needed".
2. Inspect your quest log window's Standard UI Quest Log Window component. If you haven't added a quest log window, check the Dialogue Manager's Instantiate Prefabs component. This component may be instantiating a quest log window for you. In either case, on the Standard UI Quest Log Window component UNtick "Add EventSystem If Needed".
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