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Hello, I'm using the Syncfusion WPF that you made well, but there are two problems.
First, I added tap controls once, and it appears once more like a ghost on the right side of the window.

And, when the window is maximized/normalized, the horizontal width of the left windows is maintained, but the vertical height of the upper left and middle windows is not maintained.
If the option "AllowProportionalResize" is set to False, when the window is maximized/normalized, the vertical height of the upper left and middle windows should be maintained, so please check this part as well.
I attached the example project. Please revise it.
Thank you.