The page is still small when zoomed in?
Maybe you have encountered this situation: you double clicked the flash flip catalog page to zoom in, but you still have to click the “+” button because it’s still too small. That might be because of the original PDF pages are in a big size, or the zoom scale value is too small. By changing the “zoom scale” value, you can define the default zoomed size of the flash book.
Find “Zoom Config” and set the “Zoom Scale” value. The bigger number the bigger size of zoomed page.