Enables you to switch the full-screen mode of the Spreadsheet.
SetFullscreenMode( fullscreen: boolean ): void
true to activate full-screen mode; false to deactivate full-screen mode.
In full-screen mode, the Spreadsheet occupies the browser’s entire client region and can be resized with the browser window.
According to browser requirements, if the Spreadsheet control is contained in a frame, the SetFullscreenMode method should be called in a user-generated event handler (a button click, a key press) for security reasons.