Use the search bar on the task bar and type Turn Windows Features on or off to access the Windows Optional Features tool. Select Windows Sandbox and then OK. Restart the computer if you're prompted. If the Windows Sandbox option is unavailable, your computer doesn't meet the requirements to run Windows Sandbox.

A sandbox game is a video game with a gameplay element that provides players a great degree of creativity to interact with, usually without any predetermined goal, or alternatively with a goal that the players set for themselves.