User Configuration > Administrative Templates > Microsoft PowerPoint 2016 > File Tab > Check Accessibility
User
HKCU\software\policies\microsoft\office\16.0\powerpoint\accchecker
This policy setting prevents the Accessibility Checker from checking if a slide has non-placeholder objects which might be read back out of order. If you enable this policy setting, the Accessibility Checker will be prevented from checking if a slide has non-placeholder objects which might be read back out of order. If you disable or do not configure this policy setting, slides will be checked for objects which might be read back out of order and any issues will appear in the Accessibility Checker.