If I use the command :copen
the quickfix buffer will be opened as a horizontal split.
Is there a way (a command) to open it in a vertical split instead?
Prefixing your command with :vert
modifies it to use a vertical split:
:vert copen
vim -Nu NONE
. Nevermind ;). EDIT: Ah it was because I always set the quickfix window to open at the bottom with wincmd J