The screenshots for xfce4-diskperf-plugin are out of date and are in need of a refresh. There should be at least three screenshots: 1 - With I/O transfer radio button selected 2 - With Busy time radio button selected 3 - With Combine Read/Write data checkbox un-selected to show additional options https://docs.xfce.org/panel-plugins/xfce4-diskperf-plugin See https://docs.xfce.org/contribute/documentation for details on screenshot requirements.
I've updated the screenshots and added a small description for each setting. Please review the screenshots and the text, I'm not a native English speaker, the if they're good you can close this issue :)
Thank you for the updates. Please stop using the 2nd person imperatives, such as " You must" or "You should" . This is technical documentation. Not Stack Exchange. I will roll back any changes that continues to use this to describe functionality.