Hi, you want to disable it, or hide it?
If you want to hide this button, you can add this css:
#show_hide_footer_button { display: none !important; }
Hope it helps, Ivan.

Hi, in the file ./js/script.js are the functions for button, so here you can change what happens when the button is clicked.
But I don't understand what you want, button stay on the page but have not any function when is clicked?
Anyway, in the file script.js you can change function of this button.
Regards, Ivan.