Voice-of-Shadow First, let me answer your question about the slider constraints! Sliders can be created by selecting an animation in the tree view, pressing the New... button, and then selecting Slider:

Alternatively, you can create it from the New... button while selecting the Constraints node. In this case, you can select which animation to refer to in the next operation.

By animating Frame and Mix, you can achieve a combination of poses like the following video:

Voice-of-Shadow As for whether it would be possible to preserve folders even when using the Reset button in the Constraints section, we actually discussed this issue within the Spine team before (In fact, I was one of the people who suggested this improvement). However, we decided to postpone it because handling cases where the appropriate order of constraints falls between constraints contained in a folder would become very complicated. 4.3-beta might be a good opportunity to make that improvement, so I created an issue: EsotericSoftware/spine-editor884

Regarding the binding of physics constraint parameters, it is an interesting idea, but since folders can contain various constraints other than physics, it seems difficult to use the idea of managing them by folder as it is. Also, middle-clicking (pressing the mouse wheel button) on a folder selects all elements in the folder, so something similar is actually possible with the current feature:

If this does not work for your workflow, please let me know!

Voice-of-Shadow I'm glad my answer helped! I hope you'll try using Slider to bring your ideas to life. Your feedback is very valuable to us, so we would appreciate your continued support in improving Spine.

Voice-of-Shadow Hmm, that's weird. Unfortunately, I have not been able to reproduce the bug as far as I have checked so far. If the problem occurs again, could you check the UI-related settings in Spine Settings? In 4.3-beta, changes have been made to fonts and UI scaling, so I suspect that this may be affecting something.

Voice-of-Shadow I see, thanks for showing us the video! Could you tell us how the UI scale is set in the Spine Settings? I mean the following option:

Voice-of-Shadow Thanks for the additional information! I was able to reproduce the problem, so we have created an issue for a fix:
EsotericSoftware/spine-editor886

Hi, this bug appears in the latest official build (4.2.42 released on May 21). If the full 4.3 release is still some way off, please fix it promptly. The bug is still triggered by selecting frame 0 with the UI scaled down.

It was reported and an issue created, but I wasn't able to reproduce it:
EsotericSoftware/spine-editor895
I see now that it happens only when the view width is narrow. We'll fix it for 4.2.43. I am sad that 4.2.42 won't be the final 4.2 version number.