As per the subject. This can be observed in the following StackBlitz which is forked from the Telerik documentation on resizing with three small changes:

• Remove style={{ height: '400px' }} from the Grid component in app.tsx
• Remove height: 100%; from my-app style in index.html
• Remove height: 100%; from html, body style in index.html

https://stackblitz.com/edit/react-vajzshwv?file=app%2Fapp.tsx,index.html

Logged as a bug because there is nothing in the documentation stating that a height for the Grid or Grid container must be set in order for this to work. If this is a documentation issue rather than a code issue, please advise the recommended approach for using the Grid resizable property.