How do I hide wireframes of other objects, showing the wireframe of only one? As pictured: 
What setting did he toggle and how do I do it so it looks like his layout too?
Edit: My current layout is to the right, his is to the left
After searching comments on youtube for hours I found a few people having same issue, OPTIMAL DISPLAY  on SUBSURF MODIF should be UNTICKED , and Xray dropdown under Geometry WIREFRAME should be set to 0.5  to get the same display as Andrew.