Applying Filter Changes
Although any changes you make to the graph are applied to the Preview area, they do not automatically affect your Terrain Canvas. You have to apply the changes before they affect the canvas.
You can temporarily apply your changes to the 3D Preview in real-time by holding down Ctrl as you click and drag over the Filtering graph. (Issue)
To apply the Filtering graph to the 3D Preview. click and hold the mouse button over the filter graph preview. The 3D Preview updates. When you release the mouse the 3D Preview switches back to the unfiltered terrain. (Issue)
To apply filtering changes to the Terrain Canvas, click the Apply text button beneath the Preview area.

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