Prevent ALL input (during load screen)

While my game is loading, I need to prevent the player from being able to interact at all -- e.g. mouse looks around, forward/back key moves, etc. How can I best disable ALL character input? Then, re-enabling it after the game loads.

I experimented with disabling the EventSystem, but it didn't seem to address the issue.
 
You could just disable the UnityInput and UltimateCharacterLocomotionHandler components.
 
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