It's a nice suggestion! I've opened an issue to track it, let's hear if Nate likes it too (:
Save current views layout · #298 · EsotericSoftware/spine-editor

I don't think we would save the UI layout in the project, it is more of a per user setting. It is already saved per user. What exactly are you wanting to do? Are you switching between different layouts and want to save them as presets that you can apply at any time?

In the case of different computer setups, I can see it being useful:
For example:

• on the go (only laptop screen)
• home desk (laptop + extra monitor on the right)
• office desk (laptop + extra monitor on the left. different resolution)

In the case of different Skeletons, I can imagine different skeletons being different enough that they require focus on different tasks.

• certain skeletons are more mesh-heavy and need constant weights-adjustment in the process of animating.
• certain skeletons are intended to be animated with multiple tracks, so preview view needs to be open a lot.
• depending on the skeleton, just resizing the dopesheet or the tree views is helpful.

I kind of agree that it shouldn't be saved in the project.
But the idea of being able to switch between layouts makes sense.
I'm almost sure this isn't quick and easy to implement though.

Good points. The work is not too bad, since we can already persist the layout. The work involved is mostly just the UI for saving and loading a layout.