How to start tracking a project?
When you want to start tracking a project, right-click on the DeskTime icon on your desktop's taskbar and select ''Create a project / Search for a project''.
Here you can find already existing projects, or you can create new ones, as well.
You can also pick the project you have recently been working on under ''Recent projects and tasks''.
Check out these articles with helpful guidelines for using the Project timer and Quick menu for macOS and Linux:
How to use the Project timer and Quick menu for macOS?
How to use the Project timer and Quick menu for Linux?