G     

Select Zoom In from the Fractal menu.

Your top layer should now be solid white. You can verify this by looking at your Layers list.

And, by Shift clicking the Visible icon on each layer in the list, you can see that none of 

  the other layers has changed location.

Note: If something went awry, you can always use the Undo option on the Edit menu to recover.

Next: 

Using the Clipping transform

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