* The function exists in script but calling it causes "function is undefined" error.
Answer:
1) if you are calling from another script, make sure function is correctly declared as import in it's script header
2) make sure function declared/defined above your call in script or placed in a higher script module, move function up if necessary.
* I change settings in Default Setup pane in editor, but in game nothing changes.
Solution: Default Setup affects only default configuration. If you ran winsetup at least once and saved, there's already personal configuration written in your user documents, which overrides defaults. Change the setting by running winsetup as well, or delete user config to reset to defaults.