Menu on mobile version only

Hi. I use Lucia and I love it, but need to do something that I am not sure is possible: I want the “Top menu” to only be visible on mobile devices. It currently is visible on both, the mobile version is fine (it is shown after tapping on the 3-lines icon), but I have loads of pages and if I show all of them on the “top menu”, the desktop version of the site looks awful as there are lots of menu items which make the whole site and header look displaced. Can this be looked into please? Thanks!