No visual hierarchy between session and its subsessions

Currently, when a session S creates subsessions, they get placed in a section in the sessions view named by S's worktree or something. I find this confusing because it strips away info:

which real workspace those subsessions belong to -- I want to see they're working on vscode and not "fix-markdown-editor-focus-cursor"
that the session S owns those subsessions
See on screenshot how (1) created (3) and (4) and placed under (2)

https://vscodeteam.slack.com/archives/C09MVCZKLP4/p1785239868888759