Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 81)

< > Multi-Controller
< > is an eight-direction key with center button. To use it, press lightly with the tip of your
thumb.
Used for operations such as AF point selection, white balance correction, AF point/
magnifying frame movement in Live View shooting or movie recording, magnifying frame
movement during playback, or Quick Control settings.
Can also be used to select or set menu items.
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