To switch between Workspaces you’re a member (Editor or Viewer) or Guest of:
In the Mac app Use the drop-down menu in the top-left of the Workspace window and choose a Workspace or toggle between Workspaces using ⌘1 (or the number that corresponds to your Workspace). You’ll only see documents and projects that belong to that Workspace.
In the web app Select your Workspace from the drop-down menu in the top-left to view all the documents shared in your Workspace.