If you want to see if your campaign, ad set or ad meets your rule's conditions, you can preview the rule before you create it. To preview a rule:

1. Go to Ads Manager.
2. Tick the box next to the campaign, ad set or ad you want to preview.
3. Click Create rule. A new window appears where you can set up your rule.
4. Enter details about your rule, including the action and conditions.
5. Click Preview. You should now see a preview of the results of your rule.

Note: If the campaign, ad set or ad does not meet your conditions, you can't preview the rule.

After you preview the rule, you can click Continue Editing Rule to edit the conditions of the rule or create the rule.

* Nguồn: Facebook