Children Lock
From Synfig Studio :: Documentation
The "Children Lock" parameter is a boolean value, present in all Group Layers. These are the layers that are created when you Group a set of layers.
If the "Children Lock" parameter is turned on, then:
- If you click on an grouped layer in the workarea window, the Group Layer will be selected, rather than the layer you clicked on. For example, you draw an outline, and then group it. By default the children lock is Off, and clicking on your outline in the workarea will select the outline layer. With children lock On, the group layer will be selected instead.
- Right-clicking on an group layer offers a context menu entry to "Select All Child Layers", which recursively selects all the layers under the current layer. If the children lock is engaged for any group layer in the hierarchy, it stops the layers inside that group layer from being selected by this operation.
- Hitting CtrlA to select all the Handles in the currently selected layers will select the position handles of child-locked group layers, whereas it won't when their children locks are Off.
The effect of these three behaviors is for an group layer to act as if it was a primitive layer, hiding the details of its contents from selection or manipulation.