Configuring preferences and options in Outlook.com
Thanks so much Tupay.
Here are what happened to me. (1) I followed your advice, de-select all the quick action icons. Indeed, the existing Pin and Flag icons are next to the Sender. But if to remove any of them, it'll need an extra right click for the drop-down menu, then choose the icon to be removed. So, I prefer to put them back, albeit to the bad location. Then I did (2) select them; now they are all the way to right, next to the date column. HOWEVER, this time, the icons appear ONLY next to the message that your curser is pointing to. This is helpful to avoid deleting a message by accident.
I still hope MS can put those icons back next to the sender column.