Device Insight Management

I enabled the Device Insight option to see what it can do for me.  After running it for a few weeks I didn't see a lot of value add in my particular network.  It also used up CPU cycles that I couldn't afford to lose.  I have since disabled the Device Insight option on my USG.  However, when I go into the USG under "monitor", "Network Status", "Device Insight", the list of discovered devices is still populated in the list.  I was wondering how to return the USG to show nothing in that list as if I never enabled it.  This is purely a housekeeping item for me.  I was hoping there was a command to flush the device insight table perhaps of devices no longer reporting?  It there a table keep alive?