Thank you for updating me with that information. Unfortunately, the exact model shown in the screenshot is the Dell S3222HN. This specific model does not have physical speakers built inside the display frame. To hear audio, connect external speakers or headphones to the monitor's audio-out port, or plug them directly into your computer's headphone/audio jack.
You can verify this by checking the technical specifications for your Dell S3222HN monitor. Under Tech Specs, you'll see that Built-in Speakers is listed as "No."
While this is not a Microsoft website, it is the official site of Dell