New to Telerik UI for WPF? Start a free 30-day trial
How To Change the Fold Size
Updated on Sep 15, 2025
To change the fold size you can use the FoldSize property of RadBook. It is of type Size. Here is an example below:

Example 1: Changing the fold size
XAML
<telerik:RadBook x:Name="RadBook1"
Margin="50"
FoldSize="150,150" RightPageIndex="1">
<telerik:RadBookItem Background="Red">
<StackPanel>
<TextBlock FontSize="36" Text="Page 1" />
<Button Content="Click Me" />
</StackPanel>
</telerik:RadBookItem>
<telerik:RadBookItem Background="BlueViolet">
<StackPanel>
<TextBlock HorizontalAlignment="Right"
FontSize="36"
Text="Page 2" />
<Image Width="320"
Height="240"
Source="Koala.jpg" />
</StackPanel>
</telerik:RadBookItem>
<telerik:RadBookItem Background="RosyBrown">
<TextBlock FontSize="36" Text="Page 3" />
</telerik:RadBookItem>
<telerik:RadBookItem Background="Chocolate">
<TextBlock HorizontalAlignment="Right"
FontSize="36"
Text="Page 4" />
</telerik:RadBookItem>
</telerik:RadBook>