New Empty Project    ⇧⌘N

Creates a new, empty project. You are presented with the project creation panel where you can choose from templates. The simplest project is a single audio track.

Create Logic Pro projects — Apple Support

Each project has project properties including the project tempo, time and key signature, and more. You can edit some project properties in the Project Chooser when you create a project, and change them later while you’re working. For full details about project properties, see Logic Pro project properties overview.