It seems contrary to their docs[0]:
> Recall won’t save any content from your private browsing activity when you’re using Microsoft Edge, Firefox, Opera, Google Chrome, or other Chromium-based browsers.
Without a system-level incognito mode feature I could see apps allowing users to denote their windows as DRM content to avoid Recall.
0: https://support.microsoft.com/en-us/windows/privacy-and-cont...