Steps to reproduce
- Create a new project. In my case it's Pipeline one, but shouldn't matter.
- Make build parameterized. Add any parameter with a text description. The rest options are irrelevant.
- Make sure there were no builds for this project made. Otherwise form will inherit right styles from build log.
- Open project in Blue Ocean and hit the button Run. You should see no description text in dialog form, but you can select it to make visible for you.
Found by Alexander Shorin