Before entering anything in assistant v2 the input form is only one line in size.
When you input text, that is longer than one line it increases in size to show more of that text without the need for scrolling.
After sending the prompt the input form stays as big as it was before instead of shrinking to only one line again. This is how it looks like although it can also be a lot bigger depending on your input.
It only gets smaller again after refreshing the page.
The problem occurs at least in orion for iPad and safari for Mac. Didn’t check other browsers yet.
The text input form should be one line in height only after sending my prompt. Regardless of its size before sending it.