8.1.0 rc2 Perspective Flex Container and Repeater not expanding

I am using the Ignition Platform 8.1.0 rc2 and Perspective.

I have a Flex Repeater inside a Flex Container.

I cannot get the Flex Container to use the available space in the browser. I have set the Position grow property to 1 and I have tried using google chrome and Microsoft edge but I get the same result. Furthermore, I have tried chaining the basis from auto and setting a high px.

Does anyone know why it won’t expand to full screen?

See attached current Flex Repeater settings and the result in the web browser.