All Shared Spaces can be found in the "Spaces" Menu to the left of your Tab List. Note: Team-Shared Spaces are only available on that Team's Stories Page. This applies to migrated Spaces from the legacy Stories page.
If you "x" a Space from your tab list, you can access that Space from the "Spaces Menu". If you want to edit a Space, open the Space - see our Help Center Article on How to save and update a custom Space
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