No stretch to fit content in multi-input?

I’ve seen this mentioned and it’s exactly what I need, but I’m not seeing this shown anywhere when I click on the element attributes. Anything I am missing here?

Are you talking about the Multiline Input element?..

If so, are you asking how to expand its height to fit its content?

If you are, just check the ‘Fit Height To Content’ option on the layout tab, and don’t set any maximum height.