wuxiangru915/dsh-session-manager

Install

right-click a session -> Archive (stock DSH)
  -> the session vanishes from the sidebar (nowhere to see it again)
  -> this plugin: Settings -> Session manager -> archived tab
       preview its content, Restore it (back to its original workspace
       position), or Delete it from disk (two-step confirmation)
  -> the all-sessions tab lists every persisted session (grouped by
     workspace, ungrouped ones included) so nothing is ever lost sight of

Add wuxiangru915/dsh-session-manager to your DSH config (web profile) to enable.