How to change a Project's Name / Properties

The way I get around this is to open the original project and to use the "Save As" function which should save it as a new and separate project that you would be able to have loaded at the same time. If you haven't made a lot of changes with the two projects that's your best way forward right now.

If you have already set up the Project1Test and have done a lot of work on it, you can still fix the problem but it may be a little more involved. What I typically do is create a new / completely empty project and import/copy the test suites from Project1Test into it, and save that.

The issue is that the XML project files are not referenced by name, but rather by a UUID contained in the XML of the file. If you make a straight up copy as you did, that UUID will be the same and thus the software cannot see a difference between them.