Materials tab missing I am working on blender using a friend's computer, and I cannot find the materials tab. I circled the red area where it is usually located for me.
It's there, but it's hidden because the properties editor is not wide enough.

You need to either


Scroll the header over a bit by clicking and dragging on the tabs with  MMB.


or


Expand the Properties editor by clicking and dragging on the boundary between the properties editor and the 3D view.


Example: