You can watch the video tutorial, which provides a step-by-step guide through the process.
You can hide refunded products on your invoices by following the simple steps below:
Step 1: Open Simple Invoice from your Shopify store’s “Apps” section.
Step 2: Click on “Templates” in the Simple Invoice dashboard.
Step 3: Click on the ‘Options’ section, and deselect the ‘Show Refunds’ under ‘Pricing and Taxes’.
Step 4: Please click the “Save” button to confirm your changes.