Manage buttons for each bone collection. Pin the collections you want to display.
Traditional bone collections UI or Pro version for extended functionality:
Isolate the collection’s visibility. (LMB)
Select all bones in the collection. (shift LMB)
Toggle bone collection visibility. (alt LMB)
Configure Bone Collection. (ctrl LMB)
Add new bone collection with currently selected bones (ctrl shift LMB)
Highlight the bone collection containing the active bone.
Bone Collection Move Mode