As a User I would like to be able to adjust the number of sprints used for estimating the rate of change of backlog size

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The generated release report for my project is less useful than it could be as there is no way of restricting the prediction of the blue bar to only incorporate some of the sprints. All of the other predictions can be adjusted to only use a certain number of previous sprints, so it would seem consistent to do the same for the blue bar.

For an example if this issue see the attached image. It is very clear by looking at this that the blue bar is unhelpful. I feel I would get a useful result if it were restricted to the previous five or six sprints (or three, like the other line). As it is I can only get a reasonable prediction by taking a snapshot and manually adding prediction lines.