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I have a report that needs to default to showing detail groups. The +/- toggle is set to be the opposite of what users are expecting. According to Grok, currently Power BI assumes the group starts hidden and displays the toggle with a + sign, the standard sign for drilling down. There is no way to change this. Also according to Grok, if the report is exported to Excel, Excel treats the +/- symbols correctly regardless of whether you defaulted showing the detail or not.
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