How can I change the number of images displayed at one time in Index playback mode?
Push the W on the Zoom button to view the index. Continue to hold the W on the Zoom button (or push it repeatedly) to change the layout of the index. Initially a 4-up layout, each push will expand the index to show 9, then 16, then 25 images per screen. You can return to an earlier layout by pushing the T on the Zoom button.