• Well, you can at least connect to it from SSDT.

    Choose Tools/SQL Server/New Query and then expand the 'local' node to select the connection you are interested in.

    When I did this and ran

    SELECT @@SERVERNAME

    I got some nonsense back (machine name\LOCALDB#90ACA499).

    So I tried connecting to that in SSMS, but the connection was unsuccessful (received a generic 'cannot connect to ...' error).

    If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.