As an administrator, you can allow domain authors to add co-authors to their stacks. If you do this, you should inform your domain authors about the potential risks of having many co-authors working on the same stack. Learning Toolbox does not currently have a live collaborative editing feature that would prevent authors working on the same stack at the same time overwriting each other’s work. You can find more information about co-authoring and the risks involved here.
To enable domain authors to add co-authors to their stack, click on Settings (1) in the domain panel and then click on the toggle button Allow Domain Authors to manage Co-Authors of their Stacks (2).