Using Atlassian Universal Plugin Manager (UPM)
If you are not familiar with Universal Plugin Manager (UPM), please read this document before we begin.
1) Log in as administrator and go to Administration → Add-ons → Manage add-ons
2) Search for `User Group Picker Pro` add-onin `Manage add-ons` section and click on `Uninstall` button
3) Press `Continue` when the uninstall confirmation dialog box appears
4) A message "successfully uninstalled" should appear
Notes
Manual uninstall may be performed by removing the add-on files directly and restarting Jira. However, this method is not recommended since it may lead to various problems. Feel free to contact us if you need hacks for our add-ons.