Nothing Emacs can do here as it never sees the key press. You need to modify your keyboard shortcut preferences in macOS using System Preferences -> keyboard -> shortcuts. You will likely find other useful Emacs bindings which have been stolen by macOS and which will also need to be adjusted/removed

On Sat, 22 Dec 2018 at 09:29, Leo Liu <sdl.web@gmail.com> wrote:

On 2018-11-16 18:56 +0900, YAMAMOTO Mitsuharu wrote:
> The fourth update of the Mac port based on Emacs 26.1 is now available
> from
>
> ftp://ftp.math.s.chiba-u.ac.jp/emacs/emacs-26.1-mac-7.4.tar.gz

After upgrade to mojave 10.14.2 (from 10.12) I have noticed one rather
inconvenient change from the OS. M-% is now intercepted by the OS to
capture screen. Is there any workaround for this?

Thanks,
Leo