Use the Font Color function to change the font color of the report title. By default, the report title is colored according to the selected design theme, but you can change the color from the Font Color drop-down color picker (green arrow below) in the Report ribbon.
Open the Font Color drop-down and select the required color:
Here, the title is colored according to the default color for the selected theme (green arrow):
Now the font color for the title has been changed to pink: