How do I switch back to my regular prices after a festival sale ends?

Use the same page with the opposite setting.

1. Go to Plugins → Price Toggling.
2. Set Toggle to Deactivate Toggling Price — restore the regular price.
3. Choose the same Apply To scope you used for the sale.
4. Click Preview to check the list, then click Deactivate Toggling Price and confirm.

This clears the Sale price so shoppers see the regular Price again. Your Toggling price values stay saved on each product, so you can run the same sale next year by choosing Activate Toggling Price.