To move your project to a different workspace, click the 3-dot menu toward the top righthand corner of your screen, and then click Move. From there, choose the workspace to which you'd like to move your project.
Upon doing so, you will receive a warning that some people may lose access to the project when moved, as different workspaces have different user permissions. Click the green Move button if you're okay with this change.
That's it! You've moved your project to a different workspace 👍