To add Facebook Pixel in Magento 2, follow these steps:

Step 1. Access the Magento 2 Admin panel.

Step 2. Go to MageDelight > Facebook Pixel > Manage Pixel ID.

Step 3. Click on Add New Pixel, enter the details required.

Step 4. Click on the Save button; the new Facebook Pixel will be created.

Read this guide on How to Add Facebook (Meta) Pixel to Magento 2 to add Facebook (Meta) pixel to Magento 2 using this extension.