thanks! here’s how I managed to mass-collapse every sub-folder (in U4.25):
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with the parent folder in a collapsed state, SHIFT-click on the parent folder’s little triangle to expand it with all sub-folders expanded and then again SHIFT-click to collapse it again;
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CTRL-click on the parent folder’s little triangle to open it with all sub-folders collapsed
What’s interesting is CTRL-click will only work if the parent folder has been previously closed with SHIFT-click…not really sure why this is.