How to expand row in angular with same number of columns as parent row

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I followed this link https://www.freakyjolly.com/angular-material-12-table-with-multiple-expanded-rows-example/ for expandable row but it is not working for same number of columns. Can anyone plz help. I need to show like thisenter image description here

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Rajat Bansal On

For same number of columns, you can have same template as you have for your parent table in your expandedDetail definition.

May be you can take reference from here Demo