You can remove issues from an active sprint by changing the sprint field to empty. You do this by leaving it blank but checking the update box.
You'll see this message on your confirmation page:
Leaving the field blank not only removed the current sprint but all sprints that were in that field. Meaning if you had tickets that rolled from sprint to sprint it would delete the previous sprints as well.
For me, this made a large difference it what I actually wanted to update.
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