Invite-only projects are only visible to people specifically invited to collaborate. That means everyone else within your workspace will not be able to find or access projects or folders with invite-only enabled.
This is a great feature to use if you are working on a sensitive project or if you have something in draft and aren't quite ready to share.
How to make a project invite-only when creating a project
Go to your dashboard
Click Create project
Enter a name for your project
Select the switch to make the project invite-only
How to make a project invite-only in your project-settings
Go to your project
Click on project settings button
Select the switch to make the project invite-only
How to turn off project invite-only on a project
Go to your project
Click on Settings (gear icon)
Select the switch to turn off invite-only
Note: Password protection is available on Starter, Business and Enterprise plans.