[Solved]Option "Unknown sources" gone from settings. CoreELEC 9.0.3 Kodi 18.3

I’ve just installed CoreELEC 9.0.3 with Kodi 18.3 on my box, and I discovered that the option to install third part add-ons was gone? “Expert” options are on.
I tried some googling, but didn’t find any answers.

Unknown sources enabled by default.

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Thank you!