Canon EOS 5DS - Multi Shot Noise Reduction cannot be set; The Live View image or movie shooting image is not displayed during multiple-exposure shooting; Live View shooting ends when multiple exposure shooting is performed

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Troubleshooting Guide
If the image-recording quality is set to RAW or RAW+JPEG, [Multi
Shot Noise Reduction] cannot be set.
If [On:ContShtng] is set, Live View display, image review after image
capture, or image playback is not possible during shooting (p.226).
If you perform Live View shooting with [On:ContShtng], Live View
function will end automatically when the first exposure is taken. Take
the second and subsequent exposures while looking through the
viewfinder.
When the image-recording quality is set to 41 or 61, the
multiple-exposure image will be recorded in 1 quality (p.233).
If you shoot at night when the background is dark, the shutter speed
automatically becomes slow (slow-sync shooting) so that both the
subject and background are properly exposed. To prevent a slow
shutter speed, under [z1: External Speedlite control], set [Flash
sync. speed in Av mode] to [1/200-1/60sec. auto] or [1/200 sec.
(fixed)] (p.248).
Multi Shot Noise Reduction cannot be set.
The Live View image or movie shooting image is
not displayed during multiple-exposure shooting.
Live View shooting ends when multiple exposure
shooting is performed.
The multiple-exposure image is shot in 1 quality.
When I use the <f> mode with flash,
the shutter speed becomes slow.