Add the desired layer to the map (twice). One layer is needed to display all records, second – to display the proportions. In this case we are using the following layer names:
Open the London Boroughs (main) layer properties window and in Display Query tab configure and save the style settings for this layer. In this case we have used categories to display all districts. This is how it looks:
Now open the second (proportions) layer properties window and go to Display Query/Proportions tab.
Now we will configure the proportions.

1. Here you can select a numeric data column. Values from this column will be presented in generated proportions.
2. Click here to select a style for the proportions.
3. Allows you to set base value and unit. This value will be compared with a value of the column selected in (1) section.
4. Here you can set a base size and unit. This size will be used to present the value of the column selected in (1) section.
5. Click Add button and select legend key to generate a proportion based on the 1-5 settings.

To better understand how the proportions are being calculated please look at the example below:

Value in selected column = 1.000.000
base value = 100.000
base size = 1 pixel
In this case Earthlight will generate geometry with 10 pixels diameter:
1.000.000 / 100.000 = 10
10 * 1 pixel = 10 pixels
Click OK button to see the effect.

Browser not supported