Expand only selected item and collapse others
 

I think an option "expand only selected item and collapse others" can be useful. Often there is a sitiation when I have many expanded items in the data explorer pane. If dosen't selected item will be auto collapse then my tree will be looked more compact.

Check the Collapse siblings when expanding an item option.
http://www.kinook.com/UltraRecall/Ma...reesdialog.htm

It's checked, but doesn't work as expected.

See this screen recording: http://www.kinook.com/Download/Temp/...seSiblings.zip

Expanding with double click: works. Expanding with + sign: doesn't work.

That is by design: "Even when this option is enabled, using the + button (or the right arrow key) to expand an Info Item will not trigger this behavior."