Pretty sure that this is an Android 12 feature and apps need to enable support for this. I think the feature is called chat heads, but I could be wrong.
What I'm talking about is different. All the apps I refer support that including Signal. What I'm talking about is when the notification bar appears on the top when you receive a notification, if you pull it down a small draggable window with the app will appear.
Oh got it! That's there on Samsung as well. From what I've seen most apps work in that view on Samsung, but they revert to a landscape orientation. Some apps are simply borked because they don't support landscape mode.
I think MIUI does have a whitelist for major apps so that they can maintain some consistency in how the feature works. On Samsung, they don't have that, but the experience ends up being different for every app.
Xiaomi
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