I am developing a Joomla 3.4 component where I set the component parameters in config.xml. The configuration are shown using 'JToolBarHelper::preferences'.
Is there a way to show the configuration in 2 columns.
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I am not aware of such a feature.
Behind the scenes you are actually calling com_config. So it's maybe worth inspecting the code for this component to see if there is such a feature somewhere hidden.