How to turn off all sender avatars?

Using version 9 (Win 11), I can turn off sender avatars in a list of messages by changing the column configuration and removing the avatar column.

When I open the message in its window, the avatar is displayed. Is there a way to turn that off as well?

Also, when a notification appears in the lower right, it too contains an avatar. Can I turn that off?

I think I must be missing something. Any advice appreciated!

You can disable downloading avatars from the Internet, so it won’t display them. Instead you will see a monogram, or a silhouette if you disable the monogram. But there will always be an icon of some type in that position.

Thanks. That does it.