The Trash feature in Web UI was not part of 9.10 release.

However, this feature has been developed for 10.1 Fast Track release. It includes:

• a new Trash pill/tab when browsing a Folderish document
• a new Trash Search to retrieve all trashed document platform wild
• the existing delete action performs a soft delete (i.e. move to trash)
• new actions to hard delete or untrash documents from the trash

Due to popular demands, this feature has been exceptionally backported to 9.10-HF09 but is disabled by default. In order to fully or partially enable it, you will need to add the slot contributions given in this JIRA ticket.