User Configuration > Administrative Templates > Microsoft PowerPoint 2016 > PowerPoint Options > General
User
HKCU\software\policies\microsoft\office\16.0\powerpoint
This policy setting allows you to control whether PowerPoint waits until all content is downloaded before showing a presentation to the user. This policy setting applies to presentations that are opened from a cloud-based location, such as OneDrive Personal, OneDrive for Business, or SharePoint Online. By default, when the user opens a cloud-based presentation in PowerPoint, the user can view the presentation while other content, such as images or video, continues to download. But, some functionality, such as editing and presenting, is limited or not available until the entire contents of the presentation are downloaded. If you enable this policy setting, PowerPoint will wait, when opening a cloud-based presentation, until the entire contents of the presentation are downloaded before showing the presentation to the user. You may want to enable this policy setting if you have add-ins or automated processes that rely on the entire contents of the presentation being available and fully editable as soon as the presentation is shown. If you disable or don't configure this setting, PowerPoint opens cloud-based files more quickly, so the user can start viewing the presentation while the other content downloads. Note: This policy setting only applies to subscription versions of Office, such as Microsoft 365 Apps for enterprise.