There are a few ways to remove Facebook pixels from your Shopify store:
You can remove the code manually by accessing the code through the "Edit Code" section of your theme. Simply delete the line of code that contains the Facebook pixel.
If you're using a Shopify app that adds the Facebook pixel to your store, you can remove it by uninstalling the app.
You can also use a Shopify plugin like Pixel Pal to remove the Facebook pixel from your store.