Go to the clone plus configuration properties file
For any default or custom clone operation, hide the default options that are always visible
option.copyWatchers = hide
option.copyComments = hide
option.copyWorklogs = hide
Go to any issue where this default or custom clone operation is available for cloning
Click on that clone operation
Select the project and issue type if its Clone++ otherwise go to next step
Check for the Clone options label
As there are no clone options available to choose, the label ‘Clone options’ has to be hidden.
See that attached screenshot which shows the 'Clone options' label.