wangzi For parts that are always displayed with only one attachment, such as facial features, it is easier to manage if you put them all in the same slot. A slot is a container for attachments, where only one attachment (or none) can be visible at a time. To specify which attachment is visible for a slot, click the visibility dot to hide or show the desired attachment in the tree. See the User Guide for more information:
https://zh.esotericsoftware.com/spine-slots#%E6%8F%92%E6%A7%BD
https://zh.esotericsoftware.com/spine-keys#%E6%8F%92%E6%A7%BD%E9%99%84%E4%BB%B6