If by "spill over" you mean items that will not be completed in the current sprint and hence go into the next one when you complete the sprint, then there are two things you could look at:
1. Before the sprint ends, you'll need to look at the current status of the issue - it will be a spill-over if it is not in the right-hand column on the board
2. After the current sprint is over, the issues will have the sprint recorded in the sprint field (it'll be showing all the sprints the issue has been in, including the current one)
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