To change the FPS font settings ---

Settings --> Onscreen Display --> Onscreen Notifications

Make sure onscreen notifications are turned on as well as Display Framerate.

The "Notification ________" settings will effect the font/size/placement of the FPS display.

You can set any RGB color, but obviously white works well enough at 255 for each color. I run retroarch at 4x resolution and my font size is 15.0.

"Evidence"

doesn't provide evidence

I get the hand wringing surrounding the run, but don't misname being suspicious "evidence".