If you find that your MakeCode projects have disappeared from the Home screen of the MakeCode editor for micro:bit, it may be because the browser cache has been cleared since you last used the editor.

To avoid this issue you can:

Further Information

Projects are stored in the browser's cache, a temporary area of storage created by your web browser on your device to speedily retrieve files when they are needed. It is common practice in settings where there are multiple computer users or accounts for IT administrators to clear this cache regularly to provide a consistent experience to users.

If this cache is cleared, then MakeCode projects will be removed.

There are historic reasons for clearing the cache; the cached files are not always the most recent versions and if they are not updated by the browser it can lead to an inconsistent experience using the web. If the cache is cleared, then the browser will pull the most recent file again.