Hi, RedneckSoup
Welcome to the Microsoft community.
We tested the related issue, and on video websites that support the floating window feature, we can normally use the picture-in-picture function (you might need to switch to the desktop version of the webpage, but this doesn’t work for YouTube. YouTube’s floating window feature seems to require using the app and being in the US or having a YouTube Premium).
You can first check if the floating window feature in your phone’s special permissions allows Edge to use it(In android settings) If it is enabled and still doesn’t work on the video websites you used before, you can try using a Canary version of Edge to see if the issue persists. If the problem still exists, you can use Edge’s feedback feature to report the issue to the Edge development team and wait for them to fix the feature.
Best regards
Tommy Jin | Microsoft Community Support Specialist