ErikS_in2D There is no feature to directly share the visibility state of a group, but Spine allows you to save selection groups using hotkeys, which enables you to select and hide specific slots.
However, only up to 10 selected groups can be saved, so this may not be sufficient in some cases.
The Sliders feature, added in 4.3-beta, allows you to mix different animations and easily toggle the visibility of specific attachments during an animation. Since you can create an unlimited number of sliders, this feature is useful when you want to add visibility toggles as keys within an animation rather than just for temporary organization during editing. Unfortunately, the user guide does not yet explain Sliders, so I have included a video below that shows how to use it: