Codex file access message in file explorer

A while ago, after installing the Codex Windows desktop app, I noticed a green indicator in the bottom-left corner of Windows File Explorer, next to the item count. From memory, it said something along the lines of "Codex can access these files" or mentioned the Codex sandbox. A few things I remember: It appeared throughout File Explorer, including the Home page. It remained visible even when Codex wasn't running. It also appeared when I was connected to networks where Codex was blocked. I don't remember manually enabling or installing anything to make it appear. It disappeared after I reinstalled Windows. I've since reinstalled and updated Codex, but the indicator hasn't returned. The CodexSandboxUsers security group still exists and has permissions on my project folders. I've attached a recreation of roughly what the indicator looked like. It's not an actual screenshot of the original. Does anyone recognise this indicator or know what caused it to appear? Was it a feature of an older Codex version, and is there any way to restore it?