To view the raster image only:

Click , press the R key or select View Menu > View Raster File.

To view the vector image only:

Click , press the V key or select View Menu > View Vector File.

To view the vector image superimposed over the raster image:

Click , press the B key or select View Menu > View Both Files.

You can “fade” the raster image so that it is easier to see the superimposed vectors.

To toggle raster fading do either of the following:

Press Shift+F.

Select View Menu > View Raster Faded.