The Personalization tab has been added to User Options
Users are now able to customize color, size and style of form labels, as well as the color for detail area headers, under the Personalization tab in User Options. Theme and accent color options, previously found under the Theme tab which has been removed, are now under the Personalization tab.
Administrators have the ability to enable or disable Personalization options for users.
For additional details about this change, reference JT-1655212.