Viewport Overlay
Viewport Overlays are the information that is displayed on the viewport.

There are 4 viewport overlays customization end points
viewportOverlay.topRightviewportOverlay.topLeftviewportOverlay.bottomLeftviewportOverlay.bottomRight
viewportOverlay.topRight
| ID | viewportOverlay.topRight | 
|---|---|
| Description | Defines the items displayed in the top-right overlay of the viewport.  | 
| Default Value | []  | 
| Example |  | 
viewportOverlay.topLeft
| ID | viewportOverlay.topLeft | 
|---|---|
| Description | Defines the items displayed in the top-left overlay of the viewport.  | 
| Default Value | 
[
  {
    "id": "StudyDate",
    "inheritsFrom": "ohif.overlayItem",
    "label": "",
    "title": "Study date"
  },
  {
    "id": "SeriesDescription",
    "inheritsFrom": "ohif.overlayItem",
    "label": "",
    "title": "Series description"
  }
] | 
| Example |  | 
viewportOverlay.bottomLeft
| ID | viewportOverlay.bottomLeft | 
|---|---|
| Description | Defines the items displayed in the bottom-left overlay of the viewport.  | 
| Default Value | 
[
  {
    "id": "WindowLevel",
    "inheritsFrom": "ohif.overlayItem.windowLevel"
  },
  {
    "id": "ZoomLevel",
    "inheritsFrom": "ohif.overlayItem.zoomLevel"
  }
] | 
| Example |  | 
viewportOverlay.bottomRight
| ID | viewportOverlay.bottomRight | 
|---|---|
| Description | Defines the items displayed in the bottom-right overlay of the viewport.  | 
| Default Value | 
[
  {
    "id": "InstanceNumber",
    "inheritsFrom": "ohif.overlayItem.instanceNumber"
  }
] | 
| Example |  |