Users should not be able to change display characteristics that have been specifically designed to convey information important to their tasks.
Additional Information:
The HSI may allow users to change or adjust some characteristics of the HSI, if these changes will enhance personnel performance. However, users should not be able to change display characteristics that have been specifically designed to convey important information, such as coding schemes. Examples for graphical elements include size, shape, and color codes for icons, symbols, borders, lines, and arrows. Examples for text elements include font characteristics (e.g., size, style, and color), abbreviations and acronyms for messages and labels.