1)Extension setup:
In Shopify admin, click Sales Channel => Online Store => Customization => App Embeds => Enable Discount Price
2) Block Setup:
In Shopify admin, click Sales Channel => Online Store => Customization => In Home Page drop down select Cart => Click on Cart => In Template under the Apps section click on Add block => In APPS click on Custom Cart Items
3) Check Settings if App is Enabled (ON)
4) If any other Price related App is installed, it may conflict with our App. So you can disable other pricing related Apps in order to view the Discount Widget Table on the product page.