On the Remove Business screen, you can delete an existing business by choosing it from the dropdown menu and then clicking the Remove Business button.
Manager.io doesn't delete your data. Your business will be moved into "Trash" folder in your data folder.
To restore previously removed business, simply move your previously removed business file from "Trash" folder back to your data folder.
If you are using Cloud Edition, you cannot directly access "Trash" folder due to data being stored in the cloud. However you can restore business by going to https://cloud.manager.io, login then click "Restore Business" button.