Use one of the following to save a project:
Main menu: File > Save Project.
Main toolbar: 
Right-click project: Save Project.
Keyboard: Type CTRL+S.
If a project has not been previously saved, in the Save Project dialog:
Specify the directory.
Specify a file name in the File name field.
Press Save to save the project.
Save a project under a new name
Select File > Save Project As.
Or
Right-click a project in the Object Browser and select Save Project As.
In the Save Project dialog, type a new file name in the File name field and press Save.
Save all open projects
Select File > Save All Projects.
If a project has not been previously saved, in the Save Project dialog, type a new file name in the File name field and press Save.