Remove Bulk Labels to Space Attachments

Select Label Manager from Space Tools menu
Click Remove Bulk Labels tab from Attachment Labels Operation menu and enter the name of the label(s) to be removed.
Select attachments to remove labels from attachments.
For Large Spaces

If a page contains too many child pages, please select "All attachments in this space will be affected" option.
A confirmation screen will be displayed on the following step. Click next to continue.
After removed and process completed a success message will be displayed.

Label Manager for Confluence