The autozoom function zooms the images so that the fill upp the entire screen even if their aspect ratio is different from the display.

For example, if the image has a wider aspect ratio than the screen (usually 16:9), it will add two black bars on top and bottom to preserve the original image ratio:

However in some cases it is better to enable the autozoom so that the images cover the entire screen, even if that implies cutting some sides of the screen:

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