Canon EOS 6D Instruction Manual page 224

3 Menu Function Settings
[Z2] Menu
Grid display
With [3x3 l] or [6x4 m], you can display grid lines to help you
level the camera vertically or horizontally. Also, with [3x3+diag n],
the grid is displayed together with diagonal lines to help you align the
intersections over the subject for better balance in the composition.
Movie recording size
You can set the movie recording size (image size, frame rate, and
compression method). For details, see page 216.
Sound recording
You can set sound-recording settings. For details, see page 218.
Time code
You can set the time code. For details, see page 220.
Video snapshot
You can shoot video snapshots. For details, see page 225.
224