The use of a standard or a pro is related to the add-ins launched in SW.
By default, a standard is used. On the other hand, if you want to block this pro for a given user (or a given group of users) you need to add a configuration file to be launched via the license manager.
I don't have the pdf available anymore but from memory it's in the folder below: C:\Program Files\SolidWorks Corp\SolidWorks\setup\flexlm\flexuser\licensingenduserguide.pdf
This folder is on the license server normally otherwise you have to look in the sources (to see if DVD media still sent by DS)