Use this to hide the third and fourth buttons in the hamburger selector:
body:not(.staff) {
div.menu-container-footer-links > div:nth-child(1) > ul > li:nth-child(3), div.menu-container-footer-links > div:nth-child(1) > ul > li:nth-child(4) {
display: none;
}
}
You can only select by order of buttons as far as I can tell, so you’ll have to name the buttons in an order that works for this. I had some that I only wanted admins to see so I named them zAdmin to keep them at the bottom of the list and I only have two buttons visible to all other users.