In the latest Patch 10.1 PTR build, there have been many changes and improvements to the profession window including the ability to shrink it down, a new Spark slot when crafting gear, and added requirements for different Optional Reagents.
New Minimal View for Profession Window
The biggest addition to the profession window in this build is the new “Minimal View”. You can change between this new view and the standard one, by clicking the new Arrow button in the top right corner.