Sounds like you overwrote the bindings for hide hud and because you cant bind anything to the hidden option for hide hud then it wont come back. You could try deleting the bindings and see if that resets it..
C:\Users\<username>\appdata\local\Frontier Developments\Elite Dangerous\Options
Back it up first tho.. just incase
C:\Users\<username>\appdata\local\Frontier Developments\Elite Dangerous\Options
Back it up first tho.. just incase
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