If a user leaves the organization, you may want to disable their user account to stop their access to Cascade. You may also want to disable users to reduce the cost of your subscription.
Disabled users will remain in Cascade - you can still assigned goals, tasks etc to them so long as they are appointed to a role. However they will not be able to login to the system or access any of the functions of the system via integrations or the API.
To disable a user, navigate to Admin - Organization - Users. You should see a column of check-boxes on the left side of the screen. Simply un-check any user who you don't want to have access to the system any more.
You will not be charged for any disabled users.