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Pressing <key>f</key> in the browser or viewer modes will display the current image in fullscreen mode. (In the browser mode, you can also double-click with the middle mouse button.)

Moving the mouse will activate a popup control panel briefly. This can be used to navigate to the next or previous image, or change zoom levels.

You can also advance to the next image by pressing <key>PageDown</key> or <key>Space</key>.

You can go back to the previous image by pressing <key>PageUp</key> or <key>Backspace</key>.

This can be used to implement a manually-controlled slideshow.

To exit the fullscreen mode, press <key>f</key> or <key>Escape</key>.