Here are two options
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a soft reset: There are two hamburger menus on the top left of the screen. Choose the left most, top most menu. The soft reset may or may not bring your files back on the first try. If my files disappear I use this twice along with refreshing the browser.
Here is the link with how to do this:
https://forum.freecodecamp.org/t/running-the-relational-database-curriculum-in-your-browser/500231 -
You could run most of the relational database courses, including the projects, on your own computer. When you are done working on the projects you will need to follow the instructions to run the project on the freeCodeCamp environment, pass the tests, and post the link to your repo in order to get credit for the certificate.
Here is the link with instructions:
https://www.freecodecamp.org/news/how-to-run-freecodecamps-relational-databases-curriculum-using-docker-vscode-and-coderoad
Hope this helps
P.S.
Option 2 is a great introduction to Docker if you don’t what that is, it’s almost like running a virtual machine but it’s called a ‘container’ and there are more differences, but that’s a whole article someone has written somewhere.