In Settings you can switch the app language if your organisation support more than one language. Additionally, you can opt for a dark theme, instead of the standard light theme.
It is also where you specify whether or not you want to receive notifications. These can be notifications about an Engagement or Pulse, you are asked to complete. You can also choose to have the events from the app added to your calendar. It is also here that you can change your password for logging into the app or activate Touch ID/Face ID, should your smartphone support this.