Canvas Group

이런게 있구만 묶여져 있는 UI를 FadeInOut 하기 쉽겠구만 .

관리하기 쉽겠네 .

Alpha	The opacity of the UI elements in this group. The value is between 0 and 1 where 0 is fully transparent and 1 is fully opaque. Note that elements retain their own transparency as well, so the Canvas Group alpha and the alpha values of the individual UI elements are multiplied with each other.
Interactable	Determines if this component will accept input. When it is set to false interaction is disabled.
Block Raycasts	Will this component act as a collider for Raycasts? You will need to call the RayCast function on the graphic raycaster attached to the Canvas. This does not apply to Physics.Raycast.
Ignore Parent Groups	Will this group also be affected by the settings in Canvas Group components further up in the Game Object hierarchy, or will it ignore those and hence override them?

참조 : https://docs.unity3d.com/Manual/class-CanvasGroup.html