Hi @Ali Ahad,
You may need to edit your dataset first to get the max value in your group.
I used below code and when the RNum=1, it will show the max value.
SELECT *,ROW_NUMBER()OVER(PARTITION BY ID ORDER BY TEMPA DESC) AS RNum
FROM TEST0613
And then choose the row and then go to background color, use below expression.
=iif(Fields!RNum.Value="1","red","No color")
You may set the visibility of RNum column as hide.