Using 2.10.1, I open a new Print Composer and immediately change the Page Setup Orientation from Landscape to Portrait. But the orientation of the screen does not change; it continues to display landscape.
Likewise, changing Paper Size does not affect the size/orientation of the Print Composer window.
If I add a map to the Print Composer and Export as PDF (regardless of what Page Setup is set to), the result is always landscape.
It appears that Print Composer is only capable of A4 landscape.
What am I missing?