into the main view horizontally.</li>
    <li><b>Fit to page size</b> Determines the scale factor such that all pages
fully fit into the main view horizontally and vertically.</li>
    <li><b>Rotate left</b> Rotates the pages left/counterclockwise by 90 degrees.</li>
    <li><b>Rotate right</b> Rotates the pages right/clockwise by 90 degrees.</li>
    <li><b>Invert colors</b> Determines whether pages are rendered with inverted
colors.</li>
    <li><b>Convert to grayscale</b> Determines whether pages are con