If you did not enable sprints, then all issues in the most right column will be removed from the board after 14 days. You can find more info here:
Same issues here. And they have not been updated in the last 14 days. In fact, most of them are months old.
Because of the number of done items that we cannot "empty"/remove, the page starts responding slowly. Almost becoming useless.
This is a very common issue many users are facing as you can see by reading the responses in several relating threads.
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