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Have you tried setting the preferred size for the components? If so, show that code and describe what is still not satisfactory. Mine looks ~exactly like it's supposed to, so I'm not sure what else...

It will still work for the size/orientation shown, and it can be forced even if resized by setting the preferred size of the west panel.

Ultimately, no, but you can simplify experimenting by using...

You can obtain the desired effect by setting the preferred sizes of the components in the north panel, changing the layout to flow layout and setting the preferred sizes of the check boxes in the...