Event Report allows you to view any and all "events" that happen with your tracker, events in this context being starting the engine, leaving geo-fences and any other parameters you have specified the app to notify you about such as low car battery, speeding and entering/exiting GPS blind spots
Menu (Top Left) > Report > Event Report
You can find how to access and use Event Report here: https://www.youtube.com/watch?v=xQxOhJyfnhM