This is more device specific for i.e. Samsung Tabs with the use of Samsung Dex. I noticed in most cases the browser defaults to desktop view first after entering a search. This is personally too small of a viewport when in both landscape and portrait mode.
Even though Dex is technically a desktop variant, it makes more sense to default to mobile view as it fits more to the viewport for UX. Most sites seem to default already to mobile view, it's mainly when searching something that it defaults to desktop view.