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Click Select on the vertical toolbar.
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Set the locate filter to Solids.
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Select the parent designed solid whose shapes you want to re-order.
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Click Operators List on the ribbon.
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In the Order Shapes dialog, use the Up, Down, Top, and Bottom commands to order the shapes as needed.
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Click Apply or OK to save your changes and update the designed solid.
See Place Designed Solid Command for more information on why the order of shapes in a solid is important.