If you've built your project and want to share this internally you can follow the steps below.
Log into your admin account
Click on the project you would like to share internally
Click the Share button in the top right corner
Select 'Enable Private Sharing'
You will now have a private link you can share internally with your team while the project is not publicly visible.
You can remove access to this link at any time using the 'Disable Private Sharing' button.