How do I enable lineweights for my symbology?

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I imported an OSM shapefile of roads data. In the layer properties, I classified the roads based on type (motorway, trunk, residential, etc.). I can assign colors but cannot assign lineweights. I can go through the motions of changing the lineweight but when I go back into the dialog to check the lineweight, it is reverted to a default value (0.26). How do I change the lineweight based on feature type?

QGIS 2.10



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