You need to change that treeview to have an additional attribute:
You can also do "bottom" if you prefer that. You need to put that change in a custom module, with XML, if you want that change to be permanent. You can also activate developer mode from the "About Odoo" popup, and edit the view manually through the additional menu option on top of the page. This change will be overwritten the next time you upgrade/refresh the Odoo modules, though.