If you are using a Flex Container in “Row” mode, items normally expand or contract to match the container height. This is not true for the Text Area component. It insists on displaying as a 92 pixel tall component no matter what size the container is.
We have an open ticket to address this issue. We will attempt to update this thread when a fix is applied.
You can try adding a height: 100% under style.
Thanks Jae, that works. I would have never guessed that.