In case it was not obvious to all, this is a good thing. (very annoying, especially for those of use who created fake names as work arounds back in the earlier days, and now can't remove them, but still a good thing!)
This is your "Signature Log" (probably don't even have one do you? lol) If you have med students or residents you will have been using a signature log before an EMR so that you can identify those scribbles in the chart years after the housestaff have moved on, but if you are solo, with one nurse who has been with you since day one, then what "Signature Log Book" would you need? Actually even then you should have one, (a locums might cover when you are sick? etc). The EMR does not let you erase the identity of anyone who left fingerprints in the chart. A good thing, (but very annoying).