What does the version history feature do? How does it work?

Version history lets you see and restore previous saved versions of your project. Every time you click "Save," a new version is created. If you didn't save at that point, that version won't be available.

To access older versions, the first thing to do is to save your project. Next, click the clock icon next to the green flag, select the date and time you want, and click "Restore" to go back to that version. You can go back and forth between versions as long as you have saved them.