def toggle_show_variable(self, show_variable: bool | None = None) -> None:
        """
        Toggle whether variables are shown on disassembly graph.
        """
        if show_variable is None:
            show_variable = not self._show_variable
        self._show_variable = show_variable
        self._current_view.refresh()

        Toggle whether variables are shown on disassembly graph.
        
angrmanagement/ui/views/disassembly_view.py