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How can i collapse or extend sub-summary in list view?

Question asked by jiang_aq on May 5, 2017
Latest reply on May 5, 2017 by SteveMartino

I wanna have a "+" in front of each sub-summary title in blue, when click it extend all sub lists, when click "-" collpase all, like in finder. is it possible? any one have a example file for reference? Thank you!

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