I.e., megabytes per second instead of megabits? Or, mebibytes/mebibits? Etc.
One of the files at the top level of the repository tree is
nyxrc.sample which provides a sample of different config options that can be set in your
nyxrc file. (Of course, you don't have a
nyxrc file, you have an
armrc. If you've created one.)
The option you want is
features.graph.bw.transferInBytes. It's set to
False as default, meaning figures are in bits.