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The Misc options panel forces the individual panel widths to the width of the widest panel. Open options/misc and switch to the gui builder settings, then play with the window width. If you make it wider, the border around the settings panel will follow the right edge. But if you narrow it too much, the right line of the border will be off-dialog, although there is still enough space for all the controls and the border. See issue 67632, image: http://www.netbeans.org/nonav/issues/showattachment.cgi/27722/Bild%201.png
Moreover, it seems that the options dialog is sized improperly by default on mac, check the last few comments in the mentioned issue 67632.
unrelevant to current state