Not able to make any changes

Hi,

I am facing problem with PowerBI desktop in making any kind of changes in the graphs. I am trying to format the graphs and when I try to make any kind of change, e.g. increasing or decreasing the font size, type, changing data color, etc., it goes back to its revious format. I tried to close and reopen the file, downloaded the updated version but its not helping. Does anyone know if there is a solution to this.

Thanks!