In April 2024, Concur will launch a new visual theme (SAP Fiori with Horizon) and the legacy theme of Concur will be retired. The new theme displays a refreshed, modern look and feel, improved consistency, and a more inclusive and accessible design for all users. The SAP Fiori with Horizon theme will not change any features in Concur. It is primarily a change in the look and feel of Concur – for example, fonts, fonts sizes, icons, colors, and rounded corners.
Please review the document linked here for more information.