override checkout_cart_index.xml file
and last line remove coupon code block
Move from app/design/frontend/V/T/Magento_checkout/layout/checkout_cart_index.xml
<?xml version="1.0"?> <page layout="1column" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd"> <body> ..... ..... <item<referenceBlock name="componentDisabled"name="checkout.cart.coupon" xsi:type="boolean">true<remove="true"/item>> </body> </page>