A Status Effect Settings scriptable object will be added to you Assets/Resources folder whenever it is first requested. Alternatively, you can access the settings from Edit > Project Settings > Status Effect Settings.
The 32 elements under groups will be used by the StatusEffectGroup to display all of the different groups as a dropdown in the inspector. Note that this is functionally the same as Unity's LayerMask except that StatusEffectDatas can be apart of multiple groups.