1.) POS Return Valid days Configuration

POS Return Valid days in Setting, set Global Return Days For Product

Navigation : Setting → Point of Sale → POS Return Validate

2.) Return Days For Specific Product

Set Return Days For Specific Product,if You Want to

Navigation : Point of Sale → Product Variants → Product

3.) Return Days On Orderline

Show Return Days in POS Orderlne

Navigation : Point of Sale → Shop

4.) Return Days On Receipt

Print Return Days in POS Receipt

5.) Non Returnable Product

If You wont to Product has no Return than tick on No Return This Product

Navigation : Point of Sale → Product Variants → Product

6.) Non Return Product Print On Receipt

Non Return Product Print On Receipt to 'this product is not returnable'