Freshly installed sod often goes through an awkward phase where it doesn’t look great and doesn’t grow much either. This phase is normal and temporary. The grass is focused on survival and root development rather than appearance. As long as the sod is watered properly and not allowed to dry out, the lawn usually begins showing signs of recovery once the roots take hold. https://texassodanddrainage.com/does-sod-look-dead-at-first/