Hi Edo,
I'm happy to say that this feature request is completed and available. Please check our updated width property description in our Dialog component API documentation:
https://www.telerik.com/kendo-angular-ui-develop/components/dialogs/api/DialogComponent/#toc-width
StackBlitz examples:
Using "em" units:
https://stackblitz.com/edit/angular-s9xcb2?file=app/app.component.ts
Using percentage:
https://stackblitz.com/edit/angular-s9xcb2-poc3c2?file=app/app.component.ts
Regards,
Yanmario Menev
Progress Telerik
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