The metadata display settings you choose for the Viewer and Browser also apply to photos displayed in full-screen view and in its filmstrip. The settings for the Viewer control the display of metadata for full-screen photos, and the settings for the Browser control the display of metadata for thumbnails in the filmstrip. For more information about setting the display of metadata, see Working with metadata overview.
Although the menus are not available in full-screen view, you can change the display of metadata using the same keyboard shortcuts used to change the display of metadata in the Browser and Viewer.
Press Y.
Press Shift-Y.
Press U.