truncate-lines
truncate-lines is a variable defined in `C source code
'.Its value is
nil
- Automatically becomes buffer-local when set.
- This variable is safe as a file local variable if its value
satisfies the predicate `booleanp'.
Documentation:
Non-nil means do not display continuation lines.
Instead, give each line of text just one screen line.
Note that this is overridden by the variable
`truncate-partial-width-windows' if that variable is non-nil
and this buffer is not full-frame width.
Minibuffers set this variable to nil.
You can customize this variable.