Showing %Change from Prior Month in a visual when the visual is filtered to show only current month

ldwf yes you need to define what prior month is, it is actual based on the calendar or indicator, if it is by calendar month, as a best practice, add a date dimension in your model and use it for time intelligence calculations. Once the date dimension is added, mark it as a date table on the table tools. Check the related videos on my YT channel

Add Date Dimension
Importance of Date Dimension
Mark date dimension as a date table - why and how?
Time Intelligence Playlist