This is by design as this area is intended for use with MIDI hardware. The screen is disabled when no MIDI output devices are setup in CbB. It is possible to define alternate note name entries for the PRV Note Pane with a text editor. Open the master.ins in %appdata%\Cakewalk\Cakewalk Core in the text editor (may want to make a safety copy of master.ins before editing) Under .Note Names create a section called [AD Drums]  (or whatever you want between the brackets) and add the
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