How to navigate through the images ?

1. Clic on a thumbnail = Full image ;
2. Press F11 (top of the keyboard) = Full screen. Try second time to come back to normal screen ;
3. Previous photo = keyboard's left arrow ;
4. Next photo = keyboard's right arrow ;
5. Come back to thumbnails : clic out of the full image, in the dark space. Or press Esc on the keyboard