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The Structures panel is split into several levels. The top level is View, each view has its own window (so a chart is a view, a volume tool below it is a view, etc). Within each View there are layers (a layer for the chart itself, a layer for tools applied to the chart, etc) which are part of that view.
In your screenshot, all of the Views have been minimised. You need to click on the + to expand them, where you will then see the individual layers. You can add a new layer to the desired view there (as per my earlier reply). Once the new layer has been created, click it before adding the new tool, and it will be placed within that layer.