While the version number 16.6 (171004) MAY be Windows, it is specifically also MAC:

Please move this back to the MAC version of the product area.
NOTE WELL: The Windows version has a way to turn off the animations as shown here:
https://support.office.com/en-us/article/Turn-off-Office-animations-9EE5C4D2-D144-4FD2-B670-22CEF9FA025A
The MAC version does NOT have a way to disable Office animations.
The request is to add a setting to the MAC preferences for Office to disable animations since there is not an OS based registry setting for this. The MAC Office team will need to add it to the Preferences dialogues.
This appearance of this feature without a way to turn it off is annoying, but likely just an oversight.
Again, please move this back to the MAC section.
Thanks,
Vincent