Some context to the question:
I have 2 project namely:
1. Project A
2. Project B
Both are using Scrum. And both team have with own board. So we had done sprint planning and started the sprint.
1. Sprint A (5 issues) from Project A
2. Sprint B (10 issues) from Project B
For Project A backlog, it shows:
Sprint A (5 issues)
For Project B backlog, it shows:
Sprint A (0 Issues)
Sprint B (10 Issues)