Problem Definition

With the New "full detail" Jira issue view, users lost the ability to manage watchers.

Suggested Solution

Add the ability for users to manage watchers while viewing the issue in the "full detail" view.

Previous "full detail" issue view:

New "full detail" issue view:

Why this is important

This should enhance greatly the user experience.

Workaround 

You can temporarily disable the New Jira issue view in Business projects by clicking "See the old view" (on the top right corner of the screen).