VIEWSONIC VS12835 - Manual (Page 28)

Enjoy Life, Enjoy ViewSonic
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․ Open bookmark —————————————
On the eBook setting menu, select "Open bookmark", press button to
read the saved bookmark selection. Select your saved bookmark with
the Up/Down button and press the Enter button to open. Press the Esc
button twice to return to the eBook browser.
․ Font size —————————————
On the eBook setting menu, select "Font size", press key to set font
size. Use the Up/Down button to highlight the font size and press the
Enter button to select.
ViewSonic VPD400/VPD500