Yes, it's still possible to change the number of items in Jump Lists, and here's how you perform the task on Windows 10.
On Windows 10, Jump Lists is a feature designed to give you quick access to frequent locations, recent documents, and specific features when you right-click an app from the Start menu and taskbar, and even from Quick access in File Explorer.
In previous versions, including Windows 8.x and Windows 7, you were able to increase or reduce the number of items that appear in these lists, but the option was discontinued from Windows 10.
Full story from the WindowsCentral blog...