If you need to know which component tab an object in your drawing came from, you can use the Locate component tab feature from the context menu. If you at least know the Extension an object came from, navigate to its configuration from the drop-down at the top of the Component Tabs area:

To locate the exact component tab that an object came from, follow these steps:

1. In your 2D or 3D view, select an object in the drawing.
2. Right-click and choose Locate component tab from the context menu.
3. CET opens the relevant component tab and an arrow flashes to point out the component: