In Power BI Matrix visual you can show the multiple values as row headers instead of column headers.
Let’s get stared, download the sample Dataset from below link
If you have multiple values in the Values section, they will by default show as column headers in the matrix. See below screen shot.

Matrix Visual with multiple values
Change the format to show values on rows:
Step-1: Select Matrix visual > Go to format bar > click to Values > Turn on Show on rows

Show on rows matrix
Note: For updated version of Power BI –

Show-on-Rows
Step-2: Now you can see, column header for values showing as a row header.

Matrix visual output
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