This option, in the Advanced step, sets what the AI does when it detects an ad with poor performance signals. There are three modes: Notify only (recommended and default), where you get an alert and decide what to do; Pause automatically, where the system pauses the problem ad itself; and Disabled, where nothing happens. Alerts and pauses are recorded in the optimization history, under the Alerts filter. If you prefer to keep full control over your creatives, leave it on Notify only.