Trying to find a certain XML file

I have been trying to find a certain XML file located somewhere in the filesystem. I’m fairly knew, so let me try to explain what’s going on. I’m using a raspberry pi 3. I installed XBMC and KODI 17 onto it. I wanted to make a digital picture frame, so I installed the “digital clock screensaver” add-on every time an image comes on the screen it is blown up. (It’s set to fill not fit) I want to know which file I need to go to, to get the Aspect ratio fixed. If anyone can link me the directory path it would be very much appreciated