A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Based on the description and screenshots, the issue appears to be related to the PowerPoint viewing or rendering experience rather than the Microsoft Graph API's file-access functionality.
Microsoft Graph may be involved in accessing or providing the PowerPoint file, while the actual rendering of the slides and the behavior of the viewer controls are handled by the PowerPoint/Office web viewing component.
Since the issue occurs when keyboard focus moves to the slide navigation controls and the slide area becomes partially clipped, this appears more consistent with a viewer rendering, layout, or accessibility issue.
Additional investigation would be needed to determine whether the issue originates from the application's implementation or from the underlying PowerPoint viewer component. If the behavior can also be reproduced using a Microsoft-provided PowerPoint viewing experience, the organization's Microsoft 365 administrator may consider opening a support request through the Microsoft 365 Admin Center. This would allow the appropriate Microsoft team to investigate whether the behavior is related to the PowerPoint viewer itself or to how it is being integrated into the application.