Anyone know how to remove personal Address from

As far as I know, you cannot remove the running user’s personal email address as a send-from option just through Org-Wide Email Addresses alone.

Two practical options are:

1.  Create a validation rule on EmailMessage to stop users sending from their personal address. 
2.  Change the user’s outgoing email settings so the desired email address is used instead. This can be updated from: 
    
   Profile photo/avatar > Settings > Email > My Email Settings > Email Address