The values displayed in the checkbox text in promptsets are wrapped on their display, how they should not be broken in several lines.
Their screens resolution would allow longer lines to be displayed.
Automic Web Interface 12.3.2.hf1-dev-feature-12.3.2-hf.1-96205
Automic Web Interface 12.2.4.GA01-dev-feature-12.2.4-GA01-92808
All forms have a fixed width. Therefore, if the text does not fit within the width, it will be split into a second line. Aside from the display, there are no functional limitations.
This is working as designed.