The admin/merchant/manager can add the cancellation reason while canceling or rejecting the order from the admin dashboard. This reason also will export in the order CSV.
1> Go to the admin dashboard on the side module >> configure >> order settings >> enable the toggle and add the policy.
2> Now go to the General module >>orders >> click on drop-down option on order status >> click on cancelled.
3> click on the yes button.
4> Add the cancellation reason in the text box >> click on submit.
5> This reason can be exported in the order CSV and the same you can see under order details.
In the same way, the merchant and manager can also add the cancellation reason.