When viewing a Report that is grouped by something, it might be useful to have the option to collapse the group.
Users that need f.x to review worklogs in regards to Account will then be able to group the Custom report by Account and collapse /expand the grouping he is interested in. He will not need to scroll as much and will not need to create a report for each individual Account.
( Similar to the functionality in the Resource planning view which shows all users and you can expand and collapse them to view their plan details)
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