This troubleshooting guide will teach you how to return back the color option for the right-click menu in the Issues section.
Please make sure that the Agile plugin is enabled for the project where you are in. Then go to the Issues section and right-click on a random issue. Then the Color option is appearing to you.
To fix this problem, please go to Administration (on top) - Plugins - Agile - General tab. Here, you have to set the Colored by option to be with value .
And then, when you go back to the Issues section and right-click on an issue, the Color possibility will be returned back. So, you are able now to select a particular color for this issue.