Canon EOS 80D - Manual (Page 214)

P Multiple ExposuresN
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Shoot subsequent exposures.
 The merged multiple-exposure image
will be displayed.
 With Live View shooting, the multiple-
exposure images merged so far will
be displayed. By pressing the
<B> button, you can display only
the Live View image.
 Multiple-exposure shooting will end
when the set number of exposures
are taken. With continuous shooting,
if you keep holding down the shutter
button, the shooting continues until
the set numbers of exposures are
taken.