Some settings are not yet available from the UI and is located in textfiles in the config directory of your project. These are JSON files that can be edited to change your ArtNet IP addreses, adjust backdrop image and so forth.
You can access this folder quickly from Settings (F3).
The individual JSON files can contain only partial configurations and can overlap. The order in which the files are processed is defined in configlist.txt.
Feel free to add extra files if you feel the need to modularize your configurations.