Cyclomatic Complexity Index indicates the complexity of a method by measuring the number of linearly independent paths.
When Mouse Left click over the index a menu is provided that allows you to:
Disable Cyclomatic Complexity - Turns the feature off.
Code Metrics Options - Opens the Code Metrics Options window where further adjustments could be done.
Additional adjustments like font color and index position can be done from the Code Metrics options page.
Once disabled you can turn on Cyclomatic Complexity from Code Metrics page.