The state of the DockingWindow can be changed with the help of the following code.

[XAML]

<!--Float Mode-->
<DockPanel Name="DockingWindow1"Syncfusion:DockingManager.State="Float"/>
<!--Dock Mode-->
<DockPanel Name="DockingWindow2"Syncfusion:DockingManager.State="Dock"/>

[C#]

//changing the state to Dock Mode
DockingManager.SetState(dockwindow, DockState.Dock);
//changing the state to Float Mode
DockingManager.SetState(dockwindow, DockState.Float);
//changing the state to AutoHide Mode
DockingManager.SetState(dockwindow, DockState.AutoHidden);
//changing the state to Hidden Mode
DockingManager.SetState(dockwindow, DockState.Hidden);