put {protocol}://{base-url}/integration/v1/home//user/preference
Makes a homepage the preferred homepage for the specified groups. The groups must be assigned to the homepage. If no groups are specified, the homepage will become the preferred homepage for all groups assigned to the homepage. The homepage must be enabled. See Group-Based Homepages for help assigning groups to homepages, enabling homepages, and working with multiple homepages.