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.