How to reduce difficulty on captcha for Liferay DXP 7.2

Issue

• The captcha generated in the login is unreadable, even for humans.

Environment

• Liferay DXP 7.2

Resolution

• Go to System Settings > Security Tools.
• Find and delete the following properties: 
  • nl.captcha.gimpy.FishEyeGimpyRenderer
  • nl.captcha.gimpy.ShearGimpyRenderer