How can I reset the configuration of System Monitor?

plasma-systemmonitor-6.5.4-1.fc43; not ksysguard:

The file ~/.config/systemmonitorrc seems to contain the configuration and gets recreated on application start if deleted. I’d suggest trying to delete (or move if you want to keep a backup) this file and see if everything you expect has been reset on the next start.

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@amilias, thanks, but rm $HOME/.config/systemmonitorrc doesn’t appear to be sufficient to revert customised pages, because it doesn’t appear to contain that information:

[General]
lastVisitedPage=overview.page

Right, I think after some more digging I found the page configurations here:
~/.local/share/plasma-systemmonitor/
I’m a bit scared deleteing them might just remove all pages, though, but if you copy over the originals from
/usr/share/plasma-systemmonitor/
You should be save (still better to keep backups)

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@amilias, thank you! I’ve codified it: