The most common things to do in the classifications list in my experience is to

1. Create or delete classes
2. Show or hide classes

One option for Show/Hide would be to have the right click menu be context sensitive:

• If one or multiple classifications are selected and visible, the context menu becomes "Hide selected classes" (Instead of show/Hide > Hide classes in viewer)
• If one or multiple classifications are selected and hidden, the context menu becomes "Show selected classes" (Instead of show/Hide > Show classes in viewer)

One option for Add/remove would be that the right click menu:

• Includes an "Add new classification" at the root of the menu
• If one or multiple classifications are selected, change the menu to include "Remove selected classifications" (Instead of Add/remove > Remove class, which is a slight misnomer as it's possible to remove multiple classes if they are selected)

While I know that there is the Spacebar shortcut for the Hide/Show classes that is way more used, I thought I'd suggest these changes, especially for adding classifications.

Best

Oli