How to create a flipbook at the largest widow size?

The original size is too small to view clearly, how can I resize the display window for created flipbook?

Flip PDF allows you to minish the margin to enlarge the flipbook to a biggest one.

Follow steps below:
1. Add PDF file by clicking button "Import PDF";
2. On the left option "Design Setting" box, switch "+Book" to "-Book", click "Book Margin" to set digit "0" to cancel its margin;
3. Click button "Apply Change";
4. Click "Convert to Flipping Book", select a output form from "*.html", "*.zip", "*.exe", "Burn to CD";

PS: Except minishing margin, you can also set the "Zoom In" functionality. Zoom the output flipbook in to view it more clearly.