Change to list view in left window of Messages in Big Sur
How can I view a messages list rather than all the large icons - in the left window of messages in Big Sur
Mac mini 2018 or later
Question marked as
On the left there should be a list of conversations. They usually have an icon and a bit of the latest message. If you only see an icon, it is because you have reduced the width of that pane. Drag to enlarge.
The list of messages appears on the right... are you trying to invert that?
Maybe I am not understanding what you are trying to do. If so, please clarify.