Purpose of this criterion

To make contents accessible with high colour contrast so that users who are colour blind will be able to view the content without missing out on any visual cues

How to fix

Choose one of the following options:

Option #1: Edit > Preferences > Accessibility > Replace Document Colors > Use High-Contrast Colors > OK
Option #2: Use Colour Contrast Analyser tool to check for contrast ratio and edit it in the authoring platform or PDF editor mode (This requires manual inspection and remediation effort)

Screenshots

Option #1

The image below shows you how to set your document to have high colour contrast.

Option #2

To manually check if your contrast ratio is sufficient, use the Colour Contrast Analyser tool to verify.