> ## Documentation Index
> Fetch the complete documentation index at: https://help.stiddle.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How do I set a date comparison for my campaign manager metrics?

> Compare performance period-over-period directly inside Campaign Manager.

## Apply a comparison to the whole table

1. Open **Campaign Manager**.
2. Click the date range pill in the top right.
3. Toggle **Compare to** and choose **Previous period**, **Previous year**, or set a **Custom range**.
4. Apply the change. New `% Δ` columns appear next to key metrics (Spend, Purchases, ROAS, etc.).

## Customize comparisons per metric view

* Saved column presets store the comparison setting. Create separate presets for Week-over-Week vs. Year-over-Year views.
* Turn comparisons off for lighter-weight QA sessions by toggling **Compare to → None**.

## Notes

* Comparisons rely on consistent attribution models; changing models recalculates the deltas.
* If the previous period lacks data, Stiddle shows `—` for the delta to avoid misleading numbers.