You can monitor and manage all running tasks using Task Manager.
Click Task Manager icon to the right of the horisontal menu to access Task Manager.
All created tasks appear in Task Manager grid, where you can monitor tasks, pause, restart, or cancel them using task actions, if necessary.
It might be necessary to refresh the web page to see actual state.
After the task is finished, it is no longer available in Task Manager.
You can download or manage all exported PST files using Export Results button or from Reporting > Export Results.