It sounds like you're trying to keep the main menu visible only in the desktop view and remove the mobile versions (dropdown and hamburger). Since your changes to `custom.js` and `header.tpl` didn't work, I would recommend checking your CSS files. You can hide the mobile menu by targeting the mobile-specific classes or IDs and applying `display: none;` for smaller screen sizes. Also, ensure that any JavaScript responsible for switching the menu views is disabled or adjusted. You might need to tweak your media queries to ensure the menu behaves the way you want across different screen sizes. If you're still stuck, checking your theme's documentation or reaching out to the theme developer might give you some insight into the specific classes or functions managing the mobile menu.