When I run vim in tmux, it only takes up half the screen (usually the left half). I would like vim to use up the whole screen, but don't know how. Tmux still seems to consider the entire screen as one pane though - when I press Ctrl+b q, the pane number ('0') appears in the middle of the screen. Any ideas on what the issue is (I'm not sure if it's tmux or vim)?
As @user977588 suggests, the fix here is to add:
... to .vimrc.
EDIT: if you wish to retain syntax coloring, instead use: