Sets the view of a page according to the specified string.
- viewMode (String)
- Possible values: "Fit": fits the entire page within the window both vertically and horizontally. "FitH": fits the entire width of the page within the window. "FitV": fits the entire height of the page within the window. "FitB": fits the bounding box within the window both vertically and horizontally. "FitBH": fits the entire width of the bounding box within the window. "FitBV": fits the entire height of the bounding box within the window.