Related to this question: Should "Library path" point to the source files of packages?
Fabricio Araujo suggested that is not necessary to set the 'search path' for each new project by creating a 'Default Project Option'. How can this be done in Delphi XE7?
How this can be done in Delphi XE7?
It cannot. This functionality was removed I'm not sure exactly when, but it has not been present for some considerable time.
What you can do is:
You can integrate this process into the IDE by saving your modified project template into the Object Repository. Add a project to the repository with Project | Add to Repository.