Try the demo

1. Enable Game Viewport UMG in Plugins.
2. Enable Show Plugin Content in Content Browser.
3. Open GameViewportUMG/DemoMap.
4. Press Play and switch View Mode in the widget Details (or via Update View Mode if wired in the demo).

flowchart LR
  Map[DemoMap] --> WBP[WBP_Viewport or your HUD]
  WBP --> GVW[Game Viewport Widget]
  GVW --> World[Live world render]

Compare Details panel values with the Widget reference.

Enable Show Engine Content to find WBP_SampleWidget for overlay experiments — see Custom widgets.