About, FAQ, TOS 및 개인정보처리방침을 숨기는 방법?

I don’t think you can get rid of the existence of the subpages themselves, but you can “hide” easy user access to them by using CSS. So, for example, if you want to remove links to them from the hamburger menu, you can use CSS, like

.hamburger-panel a.widget-link.about-link {
     display: none;
}

and

.hamburger-panel a.faq-priority.widget-link {
      display: none;
}