When working with a large workspace with many projects it can be useful to make it easier to identify what project a file is in.
For example, in FindSymbol it would be useful to be able to sort (and filter!) by project - adding a project column would be helpful. In many cases this corresponds to the directory names, but not always.
See also:
https://community.slickedit.com/index.php/topic,16697.0.html