You’re using Period-Over-Period to compare this month to last month.
However, today is only the 27th of August. So we’re comparing 27 days of August with the whole 31 days of July. Instead, we want to compare the 27 days of August with first 27 days of July. We can do that by changing the “Current Period” filter condition:
Now, we are getting a MTD comparison:
If you want to see an alternative approach that allows for more dynamic selections in the dashboard, then check it out here: How can I dynamically show YTD/QTD/MTD metrics in the KPI tiles on my dashboard?