One way to make a window with a fixed size while maintaining the border is to set the values ββMin [Width | Height] and Max [Width | Height] for the same value. A resize cursor will be displayed on the border, but the user will not be able to resize the window.
If the fact that the border still indicates that it is resizing bothers you, the next step is to set ResizeMode = "NoResize", but then you should start drawing your own Aero glass if you want to keep the edges of the glass.
Drew marsh
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