Canvas

The Canvas holds all UI elements. The Canvas is a Game Object that has the Canvas Component attached to it, and all UI elements must be its children. To create a UI element (such as Image), go to Game Object > UI > Image. If there is no Canvas in the current scene, a Canvas is automatically created, and the newly created UI element is automatically set to the child node of this Canvas. [1] The Canvas area is displayed as a rectangle in the Scene view to help you see the position of all UI elements without having to switch to the Game view. Canvas uses EventSystem as its messaging system.