On the Mileage, Expenses, and Income Dashboards on the web app, you can view different graphical representations of your data. To change the graph, just click the graph title in the top left corner above the graph and choose the one you want to view from the drop-down.
Note: Untagged data will not factor into your totals, so be sure to tag each of your trips and transactions as business or personal to see up-to-date totals.