Two different ways to switch between workspaces.
You are able to switch between different workspaces by clicking the Search field at the top middle of the page.
Or you can type 'CTRL- Shift- K' on Windows or 'Command K' on a Mac and it will get you the same popup window.
Type the name of the Workspace or scroll to the name of the other Workspace and click it.
This will take you to the Projects Overview page of that Workspace where you can select the project you wish to explore.