Yes! Now it works as it should.
Another point: I like it that the dialog window can be resized (I think ALL dialogs should be resizable). Except... it just enlarges the empty space around the current controls. For this dialog all controls should move with the right-side, the bottom line sticks to the bottom, and the preview window should enlarge in place. In other words, the preview should keep it's top-left point and the bottom-right point should move with the other controls, thus enlarging the preview. That is pretty generic for most dialogs: most controls stick to one or two sides and a preview or list enlarges as the dialog is enlarged. It is pretty common for window/panel design. You should also set a minimum size, in this case probably the size at which it starts. Also pretty common. Once you get used to it you can do this almost automatically when you create other dialogs.
Fixed sized dialogs are an ancient Window legacy from before .NET. In Linux virtually all dialogs are resizable except things like a message with an OK button. Message boxes are mostly modal dialogs (fixed and on top and fixed as the active window), clicking a button closes it.
(In ancient history I designed and created a lot of complex Windows Forms and controls
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