Thanks guys! It means a lot that you are happy! :happy:
@alexandr in this post, apologies for not getting to this sooner
had a little vacation to recharge!
We'd like Spine to (mostly) automatically show the skeleton you want it to show, without needing a separate setting. The issue you are having happens for a few reasons.
First, in 3.7 we now show a row with no keys when a bone is selected that doesn't have any keys. Previously we would show all keys in this case, which is confusing if you clicked something to see its keys, but the dopesheet does not show you its keys (eg, maybe you expected it to have keys).
The other half of your problem is because your root bone has no keys. After selecting the root bone (which is what happens when you select the skeleton in the tree) and then deselecting, that skeleton should be shown first. Since your root bone has no keys, the dopesheet incorrectly sorts the skeletons using the skeleton draw order (actually the reverse of the draw order, but we've just fixed that!). We've fixed this in 3.7.89 so now if you select a bone, even if it has no keys, and then deselect, that skeleton will be first in the dopesheet. I hope you find this sufficient when working with multiple skeletons!