hugo-coder-fork/assets/scss/_navigation_rtl.scss

body.rtl {
  .navigation-list {
    float: left;
    @media only screen and (max-width : 768px) {
      left: 0;
      right: auto;
    }
    .navigation-item {
      float: right;
    }
  }

  .menu-button {
    @media only screen and (max-width : 768px) {
      float: left;
    }
  }
}