On the Calendar (or 'Journal' as it was originally called), you can change the time scale by clicking the 'Time Scale' button in the toolbar -

However, when you change this setting, it only stays changed for the time you are using Ivo. When you close Ivo, it is reset to your default setting.  You can change your default setting in your preferences -

  1. Click the 'Help and Support' tab
  2. Change the 'Default Time Scale' setting which is about halfway down the list of preferences -