You must have the JIRA System Administrators global permission to install Teamworkx Issue Picker for Jira.
To open the Teamworkx Issue Picker configuration page:
Choose Jira setting > Apps.
Locate ISSUE PICKER section and select the Global Settings field.
In this page, the app will display all of the existing Issue Pickers in a table with its':
Name: the visible name of the issue picker
Selection mode: Single or Multiple Issues can be selected
JQL: the query that limits the scope of the provided issues
Visibility: the icon of projects, issue types and request types where the issue pickers will be visible
Actions: edit or delete the issue picker
To create a new Issue Picker, click on the “Create” button. It will open the dialog where you can set the: