public InputAction walkLeftAction;
public InputAction walkRightAction;
public InputAction jumpAction;
Is displayed:

I don’t know if I’m setting walkLeftAction, walkRightAction etc.
I could add [Header()] before each field, but it’s not how it’s supposed to work…
Unity version: 2019.4.11f1
InputSystem version: 1.1.1

I have the same problem.
Unity version: 2021.2.5.f1
InputSystem version: 1.2.0
Have you found a solution yet?
I recently updated software in my project and now it works.
Unity version: 2021.3.15f1 Personal
InputSystem version: 1.4.4
public InputAction walkLeftAction;
public InputAction walkRightAction;
public InputAction jumpAction;
public InputAction aimWeaponAction;
public InputAction aimWeaponGamepadAction;
public InputAction shootWeaponAction;
public InputAction useSpecialAction;
public InputAction pauseToggleAction;