ZenSports allows you to view odds for bets both in American Odds or Decimal Odds. The default view when you create a ZenSports account is American Odds.
If you'd like to change the view to be in Decimal Odds (or change it back to American Odds after changing it to Decimal Odds), you can do that from the Settings screen.
Here's how to change your Display Odds Settings:
Go to the Settings screen, which can be accessed from the "More" tab in the bottom navigation bar:
From the Settings screen, tap on the "Display Odds" menu item:
Choose which option you'd like to display your odds in and tap the blue Save button to save your changes: