emacs split the window vertically

[Sergei K. <kol...@gm...>]

Hello, all
When I press <Meta>-` to get into the menu (and then t, c to compile),
emacs split a window vertically like <Ctrl>-x-3. I'm afraid I pressed
somthing working with national characters. Looking through the manual how
to set a normal, horizontal splitting like <Ctrl>-x-2 but with no result so
far. Any ideas?

Regards,
Sergey Kolomiets,
Moscow.