How to change my antivirus provider back to Microsoft Defender?

[Brillianzha A.]

It seems that i have another antivirus provider, which is Reason Cybersecurity. I'd like to change back to Ms Defender, but i dont know how to change it. I searched it on internet, and i found out that i have to uninstall the Reason Cybersecurity antivirus. But....But when i searched in apps setting, there is no Reason or whatsoeverthanks in advance

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