Hi,
I am not sure I understand you issue well.
Let me show what I usually do.
1) Open project from examples created by RTD

2) I select for example

3) Now I can work with it

4) I can play with it and then I can decide to save and close it
So right mouse button at project and select close.

5) Now the project is closed

6) When I want to open it again then I press right button at the project name, se;ect open project and I can work with it again

7) Of course you use some work space where your project are created from examples. This is mine....

Best regards,
Ladislav