1. Log into Office 365
  2. Click the gear icon (top-right) click Options from the drop-down menu
  3. Expand the General section from the left-hand navigational pane
  4. Click Light version
  5. Check/uncheck "Use the light version of Outlook on the web"
  6. Click Save

  7. Log out and log back in for this setting to take effect

If you need further assistance, let us know. Click the new ticket button in the bottom left and we'll help you out!