There is an easy way to format reports before you save them to a script. You can edit the display box properties such as color and position in the Show Tree Structure window. In the report window, select Edit > Properties (Windows) or View > Show Properties (macOS). Click the node that you want to edit.
In Example of Showing Properties for a Plot, the Summary of Fit statistics were selected below the graph. The Background Color and Text Color were then changed in the Properties. These changes are preserved when you save the report as a script or journal the report.
Example of Showing Properties for a Plot