Shopify Pixel - Customer Events

These links will help explain what to do in GTM (there are a couple of approaches):

https://echologyx.com/how-to-fix-shopify-sandbox-url-pageview-issues-in-ga4/

https://community.shopify.com/post/2513732

https://wpfullpicture.com/support/documentation/how-to-turn-off-automatic-tracking-in-google-analytics-4-enchanced-measurement/