Where to find electronic shutter on a 1Dx Mk 3 ?

Not something I would normally would need to use but now Im working on some fairly jumpy birds in southern Spain I think its a good occasion to set it up. I cannot find it on the Menu or the guide book.
Any suggestions ?
 
Thanks for the link but I still cannot find the electronic shutter. The article says to go to liveview. I do and nothing happens, I must be missing something. I am using the quieter s option which is some help but not what I am looking for.
 
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The 1DXIII is enough to scare any bird. The R5 silent is so much better. I used to use Live View as mirrorless on the 1DXIII to be silent. I have a Hoodman Loupe - it was all a bit complicated. R5 is much better.
 
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