How to fill the client area when the main form is resized after the RadDock control LoadFromXml

[yw]

I am testing the RadDock control (2025 Q2 version).
The Dock property of dock is set to Fill.
After applying the layout with dock.LoadFromXml(xmlPath, clearDocking: false);, when the MDI main form is resized, the laid-out window does not fill the client area (as indicated by the red arrow in the figure). How can I modify it so that the laid-out window fills the client area of the MDI window?