To check Sales report as a Graph, please follow the below mentioned steps:
Step 1 : Click on Insights in the Left side tool bar.
Step 2 : Click on Total Sales.
Step 3 : Select the Date range for which you would like to see the overview.
Step 4 : Hover the cursor on the graph on any particular date. You can see the total value of Sales done with the number of transactions for the hovered date.