DLP incidents will be logged under DLP Incident manager (Menu->data protection->DLP incident manager). You can see the events here.
There are many default DLP queries related to dlp incident. You can use them or can create new query from available 'Queries and reports'.
All types of DLP incidents are available for review under DLP Incident Manager. All you need is to refine the default settings for specific types of incidents. For example--
A list of available options appears. The list contains up to 250 of the most frequently occurring options.
In EPO, you should be able to see the incidents in the Incident Manager. Go to Menu, under Data Protection column, select DLP Incident Manager. There you should see a list and a graphical representation of all incidents, including Device Control incidents.