[Feature Request] Let me shelf / save workspaces and close them to restore them later

[Arvid-ctrl]

Currently when I research something / work on a topic, I usually open a new workspace to keep everything together. However that leads to me having a lot of open workspaces that clutter the UI and make it hard to find the ones I really care about.

It would be nice if I could shelf workspaces I currently not need and restore them at a later time.