Hi everyone. Hoping someone can provide insight. While using Darktable, I accidentally clicked keyboard keys and suddenly I see red dots all over blacks and highlights. It is obviously a setting that I enabled, but I can’t determine how to undo it. Any ideas?
I’m new to darktable, and photo editing as a whole, so please be patient. 
Hi @xpain2day
Like many other software, you can Ctrl z to revert back to the previous things.
Sounds like overexposure/clipping indication. It’s one of the icons below the canvas.
That only works if the red dots are due to an editing module. It doesn’t undo changing settings.
You are correct, Donatzky, the red dots are an application setting that is applied to all photos when they’re pulled up, and not part of a specific photo edit.
FYI, in case this helps someone else one day. I uninstalled the application, deleted the darktable folder in Program Files, as well as the darktable folder in the AppData folder. After that, I reinstalled Darktable and the problem was resolved.
Wait, did you really reinstall the application?
Didn’t pressing the “O” shortcut (the clipping indicator), or the button just do it?
I think for most people deleting everything and reinstalling is the nuclear option, only to be done if you’ve truly exhausted all other options. In this case I think there were almost certainly better solutions to be tried first.
It would be good to read up on all those little icons shown by @Donatzsky . If you right click on them most of them have options that control key settings
I don’t think it’s a secret that removing all traces of a program will reset settings. In this case simply deleting the folder in AppData would have been enough, though. But it’s really only something that should ever be done as a last resort, when everything else has been tried.
Did you first try to see if any of the icons I mentioned had been activated?
Thanks, everyone, for your input. I had only just installed the application the previous day so wasn’t going to lose any personal settings, which is why I went with the nuclear option. Funny, because a few minutes after I started working again, I once again accidentally enabled the ‘red dots’, but this time around I was well aware of the keystrokes. Turns out, as Pizzacutter mentioned, pressing the ‘O’ took care of it.
Also, great to know that deleting the Appdata folder will generate the same result.