public final ObservableList<ToolbarItem> getToolbarControlsLeft() {
        return toolbarControlsLeft;
    }
Returns a list of the currently loaded toolbar controls on the left.

@return a list of the currently loaded toolbar controls on the left.
@implNote Use this method to add or remove toolbar controls on the left at runtime.
workbenchfx-core/src/main/java/com/dlsc/workbenchfx/Workbench.java