Triggers are the specific scenarios that will cause this campaign to take affect. For example, if you want this campaign to take affect in the scenario where someone does a search for "tops", the trigger simply needs to be set to "Search for 'tops'".
You can edit, add to, or configure complex trigger sets with the Trigger Toolbox. The initial view of this toolbox shows you the list of scenarios that will trigger your campaign. By default, you'll have the one trigger that you set up when creating your campaign.
You can add a new trigger with the "Add New Trigger" button at the bottom of the trigger list, or edit an existing one by clicking the orange edit symbol to the right of that trigger name.
While creating or editing a trigger, an edit modal appears to allow you to easily configure this trigger. A single trigger can include many combinations of conditions: Search Queries and Filters. To add a query or filter to this trigger, simply click "Add New Query" or "Add New Filter". The most basic kind of trigger will only have one search query or one filter. Once you're done, click "Done" at the bottom right to return to the trigger list. If you'd like to go back without saving your changes, click the "X" at the top right.
If you have more than one trigger set up, you'll now see them all in the list of triggers. The blue line at the left of a trigger indicates that this trigger is the one currently being previewed in the product grid. Different trigger scenarios will show different sets of products. You can switch between which one you're previewing by clicking on the trigger itself. To remove a trigger, click the grey minus symbol at the right of a trigger.
Complex trigger scenarios for very specific situations can be set up include more than condition in a trigger. For example, let's say you wanted to merchandise for any customer that searched for "tops" and then used facets on the search results page to filter the products by the color "silver", and by the material "polyester". You would set up a single trigger to include all 3 of these conditions:
Remember, every single condition in a trigger must be met at the same time for it to take affect.