In Chrome OS, the device personalization options are in the Settings. Now you can see the Chrome OS Personalization Hub on Chromebooks.
How to turn your Chromebook screen saver into a Google Nest display of sorts with Chrome OS 88
It’s easy to customize your Chromebook screen saver to look more like a Google Nest smart display. With Chrome OS 88 you only get your choice of images or albums from Google Photos, the time and local weather. Perhaps this functionality is expanded in the future?