The settings window allows you to control album-wide aspects. Each album project maintains a unique set of settings. These album-wide settings (unlike image specific settings) needs to be saved with the album project to be persisted. This allows you to play with the multitude of settings found here and easily revert to the last saved settings
The settings window is divided into the following sections:
At the bottom there are two buttons: "Ok" and "Apply". You usually only use "Ok" to confirm the settings and close the window, but when having the preview view mode open, these buttons operate like this: