The visibility of your workspace can be changed using the buttons on your dashboard. There are a number of ways to share a workspace, and the type of plan you are subscribed to will determine which of these can be used. See the pricing page for more details.
The workspace can be only accessed by signed in users who you have given access to using role-based access.
The workspace is public on the web, and can be accessed by anybody without signing in. The public workspaces URLs easily guessable, so use this feature with caution.
Sharing link Shareable
A sharing link can also be enabled/disabled for individual workspaces. The sharing link is a simple way to provide people with a read-only view of the diagrams, documentation, and explorations in a workspace. A sharing link looks something like this:
Although the link uses a random token (a GUID), which is incredibly unlikely to be guessed, please do remember that, like sharing links in other online applications, anybody who has access to your link has (read-only) access to your workspace.