Beyond the main features, there are additional functions to make bone selection more comfortable.
Alt + Mouse Button 4 (Back) in Object Mode
A feature to simplify switching to Pose Mode. Select an object with an Armature modifier and execute—it automatically selects the linked Armature and switches to Pose Mode. You can even roughly box-select the object along with its Armature to switch to Pose Mode.
This feature works even when multiple Armatures are included.
Alt + Mouse Button 4 (Back) in Pose Mode
Allows you to control Bone Collection visibility from the Armature properties directly in the 3D View. In addition to standard visibility toggle and solo display like Blender's default, it includes a unique filter feature that lets you display only the collections used for animation.
Adds a feature that displays the registered CBP hierarchy structure in the 3D Viewport, allowing you to check it alongside the current selection state. This feature is disabled by default and can be enabled from Preferences.
To be honest, this feature is probably almost useless in actual production. If anything, the intense UI animation will break your concentration. It also has a rendering cost, so it becomes even less practical in heavy scenes.
It was made as a fun experiment, but I do like the way the UI looks. I hope you enjoy it.
