Is this possible. Cannot seem to set it to the side.
You could remove it from the Default Tray and place it on a tray of it’s own.
Go to Window>Default Tray. Uncheck Materials from that menu.
Then go to Window>New Tray. Give it a name “Materials” and check Materials. Click Add.
You should now have a Materials Tray of its own that can be floated around or docked. Note that “Dialogs” such as Materials/Entity Info/Styles etc can only reside on one tray at a time.
Hope that helps.
Some useful reading here too: