You might be using the latest Kendo UI for Vue, but the stylesheets are definitely not the latest. Kendo themes are already at v10, but the example references v6. Also releases from 2023 and onward do not distribute the font icons any more, so if you rely on them you should reference them as well - [docs](https://www.telerik.com/kendo-vue-ui/components/styling/migrating-font-to-svg) and [docs](https://www.telerik.com/design-system/docs/foundation/iconography/font-icons/#usage).