It would be amazing if within the drill down view you were able to filter on a list of values for items that are non blank or non zero. So for example if you're looking at a calculation with a dimension that has 1000 items you can see only the relevant items with non zero or non blank values that contributing to the number.
This is something that is regularly brought up as an anaplan issue that needs to be solved.
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Please consult your internal administrators prior to applying any of the ideas or steps in this article.