Follow the steps given below to unpublish a question:

1. Go to the “Product Questions” category on the left bar.

2. Click the “Unpublish” button of the question you want to remove.

3. A dialog box will open, asking for the reason you want to unpublish the question.

4. Select the option that explains your reason the best and then click the "Submit" button.

NOTE: Once you unpublish a question, it will no longer be visible in your store.