Method set_controls_help

src/plot_widget.rs:845–847

Enable or disable the in-canvas controls/help UI (`?` button + panel).

(&mut self, enabled: bool)

        {
            self.canvas_caches.static_layer.clear();
            self.canvas_caches.overlay_layer.clear();
        }
    }

    /// Set full interaction controls behavior for the plot.
    pub fn set_controls(&mut self, controls: PlotControls) {