Is there any way to turn those blocks ‘green’?

Is there any way to stop the tail from growing?

When a block is 100%, it can be closed and normally disappears unless the filters have “closed” selected. If it is displayed, it shows as green.

The “tail” is showing the difference between a block’s actual end-date and today (or closed date). The block will remain red until closed because it’s overdue. The end-date and error will both be red as well.