In the left navigation pane, the complete listing of the linked table will appear. You can easily identify the linked table by the little arrow icon present to its left. Also the SQL Server tables use a globe icon, which is quite different from the table icon used for a linked access table.
The dbo_ prefix represents the schema name from the SQL server database. In sql server this is indicated by dbo. for example, dbo.Artists.
It's not necessary that the all table belongs to dbo schema, so your table can have a different prefix, depending on the schema that each table belongs to in sql server.
Now you can open up your linked table in datasheet view and update the data as needed. Any data update in access are seems updated in the SQL Server database. Just the same, any modification done from within SQL Server is also getting reflected in your linked tables in Access.
Now you can easily open the linked tables in design view but can't do any modification in the design. To make any changes to the design, it should be done to the source database.