How can I resize columns

I love standalone with Chrome but the rightmost column (that with info, notes, tags that displays details of the selected paper) is too wide, I wish there was a way to hide it or minimize it, or show at the bottom). I can resize the leftmost (my library) until it disappears completely and I wish I could do the same with the right one.

Zotero 2.1a3, Mac Os 10.5.8/Intel

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