The comment feature in One Step Checkout plays the role as a note from shoppers for store owners. The order comment is designed to display right under the order review. Hence, your customers can write down their extra requirement for the store. Moreover, order comment is also created to have the possibility to display in the order, invoice, pdf, email in both frontend and backend.
To enable comment order on the checkout page, you can choose
Mageplaza > One Step Checkout > Configuration after login the backend admin.
In the next step, click to expand the
Display Configuration section, then turn the
Show Order Comment field to Yes to activate the order comment or leave the field as No to disable it.
Finally, click on
Save Config to finish.