Traders can update their charts to show order pairings. This will allow them to see where certain fills were processed and can help with reporting.
From your chart, you will need to select the 'Chart Settings' box and select 'Show Fills'. When that is checked you will be able to see lines connecting buys and sells.
If you would like to update the colors of your fills you can select the 'Configure Chart Elements' which is located right next to the 'Chart Settings' icon. A box will come up that will allow you change the colors and settings of your chart.