I have been emailing with Microsoft Support for several days about this, and finally last week on Thursday they gave me a direct link to Feedback (I had been leaving Feedback, but apparently not quite correctly somehow). At that time the support person (same person on email the whole time) told me that I should be able to change it in a few days. I waited until the beginning of this week and was told that this was new and they could not change it yet.
It is infuriating! As many people have already said, whose great idea was this? It slows down everything so much - I work on a laptop and I have to really slow down in order to use the Quick Actions on the right, and make sure, for example, that I'm not deleting the wrong email!
Is anyone at Microsoft actually reading this feedback?