Extend searching open tabs with workspaces
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You can Press F2 / ⌘ E to open Quick Commands then enter a search term to find tabs which are relevant to that term.
Under Settings - Tabs, there is a workspaces rules section, cunningly hidden if you ask me.
This is would be more useful is by searching your open tabs, you could move the found tabs to a particular workspace or create a new workspace for them. It might also be nice to have a search option on the tab context menu but that's a stretch goal for this feature request.