If you have an ArcGIS Online for Organizations account, ESRI will be pushing out an update that will change your home page. If you do not switch to the new home page or request an extension (good to September 2022), your old (legacy) home page will be automatically replaced with a default home page at the next ArcGIS Online update, planned for March 22, 2022. To ensure that your home page looks and performs as desired, transition to the new home page before the legacy home page is automatically replaced. Organizations that do not use the ArcGIS Online home page as a landing page will be automatically transitioned to the default home page. No further action is required.
For more information and how to change your home page with the new editor, click below.