I faced a problem and I was hopping you people can save me. I installed lightroom classic and added 2 photos and edited them it was all fine but the next day when I turned my computer on I saw the last editing or a preset applied to all the photos on my computer, when I click and open a photo it is the original version but after 1 or 2 second it changes and it turns to an edited version. I even deleted lightroom and everything related to the app but it didn't work and I even copied the photos to another computer and the exact same thing happened Photos just change.
Lightroom-Classic never changes the image data of your files on the hard-drive.
LrC creates its own preview to dislpay in the catalog, and its appearance can be altered by any Profiles or Develop Presets that might be applied in the import process. But it is only the 'Appearance' of the image in LrC! You can change that in many ways as you choose.