Re-order and re-parent in the scene tree

Change which shape a boolean keeps, or move a shape in or out of one.

Order is not decoration inside a Subtract: the first shape is the one that is kept, and every shape after it is removed from it. Move up / Move down changes which is which without rebuilding anything - useful when three or more shapes are involved and Flip order, which reverses the whole list, is too blunt.

Dragging a row moves a shape between parents. The middle of a row nests into it; the top and bottom edges drop it beside that row; the empty space below the tree lifts it out to the top level. Only a boolean can hold other shapes, so a row that cannot take one shows no nest indicator - a modifier like Hollow wraps exactly one shape, and a generator rebuilds its own contents from its settings.

A shape never moves when you re-parent it. Its position is stored relative to its parent, so OwlCAD re-states it against the new one: the tree changes, the model does not.

1. Right-click a row and choose Move up / Move down, or press Alt+Up / Alt+Down.
2. Drag a row onto the MIDDLE of a boolean to put that shape inside it.
3. Drag onto the top or bottom edge of a row to drop it beside that row instead.
4. Drag to the empty space under the tree to lift a shape out to the top level.