Select Previous Project: Switches to the previously opened project.
Select Next Project: Switches to the project that was opened after the current open project.
Select Project 1–20: Switches to the project based on the order in which they were opened. The last opened project is Project 1, the previously opened project is Project 2, and so on.
When you open a project, Logic Pro analyzes the project to determine which channels are needed for project playback. Only PDF
Logic Pro Instruments: PDF