This policy setting controls whether accessibility issues are checked for automatically while the user is editing a presentation. By default, accessibility issues aren't checked for automatically.
If you enable this policy setting, accessibility issues are checked for automatically and users won't be able to turn it off. The status bar will indicate if accessibility recommendations are available to make the presentation more usable by people with disabilities.
If you disable or don't configure this policy setting, accessibility issues won't be checked for automatically while editing a presentation. Users can turn on automatic checking by going to File > Options > Ease of Access.