Using classic Outlook for Windows in business environments
I have 365 Family and before that, Hotmail Plus (both are the paid versions), so I don't ever get Advertisements. My delete icon in the Quick Actions menu/feature is now always on the far-right after the change, never anywhere else. NOTE: I have the Preview Pane at the bottom (the Quick Actions are slightly different if you have Preview Pane on the right). But...you definitely may be on to something here; maybe it does have to do with the Advertising and they just made the change across the board, even for paid subscribers.