I was testing the feature allowing boards to view data from multiple projects. I arbitrarily picked two projects in my test board, and it automatically shows the sprints from those two projects. Now, I want to delete the test board, but it says I cannot, because the sprints are active. I could close the sprints from the test board view, but I worry that if I do so I will be closing the sprints for all other boards as well. How can I delete my test board without affecting the real data/real sprints for the projects that the board is showing?