In Organization Settings, select Projects in the left-hand navigation.  Then, next to the project you want to delete, click the three dots and you'll get the option to transfer ownership or delete the project:

If this process doesn't work...

One thing to note is that you cannot delete a project while it has any child objects.  This includes any submission tokens, integrations, or attributes.  If you're running into errors when attempting to delete a project, go into the Project Settings for that project and remove any child objects in any of the sections in the left-hand navigation.

The most common lingering item that prevents project deletion is a leftover submission token.

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