The problem is that list is so long, that I cannot select a sprint from the top. Currently, as a workaround, I can decrease font size and see a full list. But in a while this list will grow more and workaround will not help anymore.
I'm following Al-Shargabi's direction: Stats on sprints from a few months back are probably not so interesting. So you can un-associate your board from those sprints by removing the sprint reference from all issues of the old sprints. Then the sprints will not show up on your drop-down list anymore. If you're currently in sprint 150 you can bulk edit all issues of sprint<100 and remove their sprint id.
sprint in closedSprints() and sprint in (1,2,3,4,5,..... 99)
To find the sprint number look at the link to the sprint in one of your issues-
I believe that this KB article might help in your situation:
Take a look at it, and let us know how it goes.
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