Ah, okay:
- Click “settings” in the top right
- Click “project settings” from the dropdown
- On the left side of this window, there is a list, scroll down to the “Engine” section, and select “Input”
- I’m not sure exactly what your input setup is like, but there should be something called “LookUp”, or similar
- Under that section, there should be a dropdown with “Mouse Y”. Change the “Scale -1.0” to “Scale 1.0”