You can specify the mode to enter from the command-line, using the appropriate switch. For example, to start cctrl in Expert mode:

shell> cctrl -expert

The default mode is Logical.

You can also change the mode from within cctrl by issuing the appropriate command. For example, to switch to Expert mode:

[LOGICAL] /alpha > expert

WARNING: This is an expert-level command:
Incorrect use may cause data corruption
or make the cluster unavailable.

Do you want to continue? (y/n)> y
[LOGICAL:EXPERT] /alpha > 

The current mode is always displayed as part of the command prompt within cctrl.