Nearly all tutorials on the Adafruit Learning System are written such that the user can use the web version of MakeCode. The web version runs on multiple computer types providing broad compatibility.
There is another version of MakeCode available from Microsoft in the form of an app that runs on Windows 10 machines.
In the Windows 10 Search bar (usually next to your Start Button), type "Microsoft Store". In the search bar for the store app, type MakeCode. Select MakeCode for Adafruit.
Click the Install button for MakeCode for Adafruit. The app will install and you can then press the Launch button.
The introductory screens are identical to the web application.
The interface looks nearly identical to the web version but has a couple of differences noted on the next page.