New Layout

So, I'm trying a new layout on here.  What do you think?

It's quite plain; not really my style; but a nice change, I guess.

In the top left-hand corner you see several display options.  These are intriguing to me because I don't understand what's happening there.

Can each person choose how he/she wants to view my page?

Or is it set to whatever I choose?

These questions perplex and fascinate me.  And if a blog design can do that, it must be good.