Visually differentiate disabled prompt segments

Problem/Motivation

Disabled prompt segments could look different for very easy differentiation.

Steps to reproduce

Proposed resolution

1. Reduce preview length of the segment's contents, because disabled segment is not as important.
2. Maybe change color, or gray out (add class attribute to the disabled segment row, so it could be styled with css)

Remaining tasks

User interface changes

API changes

Data model changes