I use the format YYYY-MM in a parameter to choose the year/month. And I have the following expression on the top of my report:
="This report is for the month " & Parameters!MnthYr.Value
Which shows "This report is for the month 2021-08"
I would like to list out the full month and year, so it states (for example) "This report is for the month August, 2021"