# Page Fold Size

## Content



One way to customize the appearance of the book as users flip pages is by setting the size of the page fold using the [C1Book.FoldSize](/componentone/api/wpf/online-extended/dotnet-framework-api/C1.WPF.Extended.4.6.2/C1.WPF.Extended.C1Book.FoldSize.html) property. Page folds, which appear when users mouse over certain book zones, serve as a cue to users that a page can be turned.

When you set the **FoldSize** property you will be setting the size of all of the page folds – this includes the right top and bottom folds and the left top and bottom folds. So for example, when C1Book.FoldSize is **40**, the bottom left and bottom right folds appear similar to the following image:

![](https://cdn.mescius.io/document-site-files/images/babf1807-69aa-4d8a-96b6-d6c6d9325368/page_x0020_fold_x0020_size_files/image001.png)

If set to a higher number, the folds will appear more prominent. When **FoldSize** is **80**, the bottom left and bottom right folds appear similar to the following image:

![](https://cdn.mescius.io/document-site-files/images/babf1807-69aa-4d8a-96b6-d6c6d9325368/page_x0020_fold_x0020_size_files/image002.png)