I have a Samsung Galaxy S8 , and my photo editor randomly changed , I have basically editing on the bottom, Filter, Paint, Stickers, so now when I go to edit a photo, to pro edit with Tones, Brightness and contrast I have to click the 3 dots in the upper right corner , and click open with Editor Pro, which is the Editor that came with the phone, how to I set it back to the usual editor , I don't even know what my gallery is opening photos in.
It wouldn't change without something being changed. Was there an update for the phone or the camera app? Did you install any updates to other apps like gallery or other photo/image apps? Did you install any new apps? Any of these could have change the settings. If that is the case, you would have to uninstall the app or update to revert back to what it was.