That box is used to configure the toolbar.
Your toolbar is already extended, so just select the tools from the toolbar.
but if i want to use the star is not allowing me!
Can you please tell us what you are doing? Pressing the rectangle tool and hold and then the hidden tools don't show?
Maybe take a look at some of the introductory parts of the documentation? https://helpx.adobe.com/gr_en/illustrator/using/tools.html
Is greyed out as already exists in your tool. You probably put in your swirl tool. Click and hold where I circled in red