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First of all, sorry about that. You are right, "Configurable List" needs to be improved for this. I'm going to open ticket to our developers about this.
Alternatively, you can try other report formats. For example, "Grid Report" has better looking than excel and it groups the values. HERE is the tutorial about how to do it. If you want to downloadable version of the report, you can use THIS method to download it in PDF format.
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