I just updated to One ui 6 on my Galaxy A54. It is the official release. But i encountered some little bugs like, this remove button thing. It is for close an app from the picture in picture mode. I closed the app but the remove button won't go away....
In One Ui 6 Samsung is going to change the default emojies. I guess the Note 10 will get that update because of Samsung's 4 years major OS updates. I believe that is the only way to change default emojies.