You can add the complementary products block to your product pages in the theme editor. Learn how to use the Shopify Search & Discovery app to choose complementary products for your website’s product pages.
Displaying complementary products to customers makes it easier for them to discover new products, and can help increase online store sales.
Note: To have this feature, you must install Shopify Search & Discovery
1. Configure Product Recommendation in the app.
You need to access the app and configure the product related.
2. Add Complimentary Products block to Product Main.
Add this block to the Product Main. From there, modify the Title, and arrange its placement as desired using drag-and-drop functionality.