Try the demo

The plugin ships DemoLevel with a pre-wired HUD that spawns a draggable window at play time.

Steps

1. Enable Draggable Window UMG in Edit → Plugins and restart if prompted.
2. In Content Browser, enable Show Plugin Content.
3. Open DraggableWindowUMG/DemoLevel.
4. Press Play.

sequenceDiagram
  participant PC as Player Controller
  participant HUD as WBP_DraggableWindowSampleHUD
  participant DW as WBP_DraggableWindow
  participant Child as Child content widget
  PC->>HUD: Create widget / add to viewport
  HUD->>DW: Create Draggable Window
  DW->>Child: Add Content Widget Class

What to observe

• Drag the window by the title bar (WindowTitleBorderWidget).
• Resize from the bottom-right grip if Enable Resizing is on.
• Double-check Class Defaults on WBP_DraggableWindow against the Widget reference.

Next

• Spawn a window at runtime — replicate the HUD pattern in your project.
• Customizing — change art and layout bindings.