QualitySettings.DecreaseLevel

public static void DecreaseLevel (bool applyExpensiveChanges= false);

Parameters

applyExpensiveChanges

Should expensive changes be applied (Anti-aliasing etc).

Decrease the current quality level.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        QualitySettings.DecreaseLevel(false);
    }
}

IncreaseLevel and DecreaseLevel functions only apply anti-aliasing if applyExpensiveChanges is true.

See Also: IncreaseLevel, Quality Settings.