Multi-line text input

I have text input field to enter the body of an email message. The field has multiple lines. I did this by adjusting the height of the text field in isolation mode and it worked well until the UDS was released. Now I am back to seeying a single line of text. I tried to go i to isolation and modify height using Fit Contents, Exact Size, and Custom. Nothing works. If somebody has it working, please help me