Animator State & Animator SubStateMachine uses IMGUI to render. Even if you enabled SaintsEditor, the StateMachineBehaviour will display incorrectly for some SaintsField attribute (because IMGUI still have some problem in rendering).

You can use Tools - SaintsField - Enable UI Toolkit To Animator to hijack Unity's default drawer to UI Toolkit's implement.

Warning

This feature uses a lot of undocumented/internal API from Unity which may not work at all in feature version of Unity. Remove SAINTSFIELD_ANIMATOR_EDITOR_HIJACK marco if you face any issue and report it

Before:

After: