Use this guide to update lookback window settings on the Canvas (new experience). Adjusting the lookback window changes how far back the system reviews user behavior for audience qualification. The default setting is 90 days.
- Click here to learn how to edit an audience.
| 🟦 The New experience toggle is hidden for illumin clients who joined after August 25, 2025. |
Steps to edit the lookback window for one tactic
The lookback window defines how far back the system reviews user behavior. Follow these steps to customize the lookback window setting. The default setting is 90 days.
- Open a campaign.
- Select a tactic.
- Click the Audiences tab.
- Use the checkboxes to select one or more audiences.
- Go to the side panel.
- Optionally, enter a new number in the Days field.
Steps to edit the lookback window in multiple tactics
- Go to the Audiences table.
- Use the checkboxes to select one or more audiences.
- Go to the action bar.
- Click the Lookback window link.
- Select the Edit for multiple tactics menu option.
- On the next page, use the checkboxes to select multiple tactics.
- Click the edit button.
FAQs
How does the lookback window affect audience size?
The lookback window directly affects audience size because it defines how much historical behavior counts toward qualification. A longer window often increases audience size, while a shorter window narrows it to more recent activity. Changes apply at the tactic level and influence future qualification only.
Can different tactics use different lookback window values?
Yes, each tactic can use its own lookback window value. Marketers can set one number for a single tactic or apply another number to different tactics in the same campaign. This approach allows more granular audience control across strategies.
What if no value is entered in the Days field?
If no value is entered, the system uses the default 90 day lookback window. The default applies automatically unless a marketer specifies a different number. The setting remains in effect until it changes again.