Hi there,
1. What do you mean by overlaps? The off-canvas panel should sit on top of everything else on the page when it’s opened. You can add a menu to it in Appearance > Menus.
2. That’s because you have the search icon added to the mobile menu as well. You can tell it to center like this:
.nav-search-enabled .main-navigation .menu-toggle {
text-align: center;
}
3. Yes, the Secondary Nav module needs some updating, especially when it comes to tablet/mobile options. Noted ๐
Thanks!