In the Option display at the top of the window is the word Preferences. click Preferences. You have a choice of which market (s) you would like to see. Currently it is set to "All". If you right mouse click on a gray column header in the Option display and then Add a Column and select Exchange as the data fill, you will be able to see which exchange each quote is from. Or in Preference you can select "Primary" exchange and only view primary data.