Return windows
Each rule sets how many days customers have to return an item, counted from the day the item was fulfilled.
You set the return window for each rule in Settings → Return policy. Select Edit next to a rule and set Return Window (days) under Basics, from 0 to 365 days. 0 means items under that rule cannot be returned (final sale). The default rule starts at 30 days.
How the window is counted
ZenReturn counts the window for each item from the day Shopify fulfilled it. If Shopify has no fulfillment date for an item, the window starts on the order date. Items in one order can have different windows when they were fulfilled on different days.
When a customer looks up an order, the portal checks the window of each item. An item whose window has ended cannot be selected, and the portal shows the return-by date of the items that can. If the window has ended for every item, the portal tells the customer that the return window has expired.
Different windows for different orders
The window comes from the rule that matches the order. To give some orders a longer or shorter window, add a rule with conditions, for example a 60-day rule for customers whose tags contain vip. Conditions need the Pro plan or higher.
ZenReturn has no setting that marks a product as non-returnable.