check this one Unable to re-verify wallet - #118 by Mattches
I am also having this issue and there is not place in which you can deactivated it I have tried with Gemini who I use and there support said brave has to unlink them but is not really know for helping accordingly to Gemini
@Mattches hi, question here, how will I know when I will be able to verify a new wallet?
We will email you informing you that your request has been completed.
When brave team will be release new feature to self unlink devices
i guess that will be hard as many would miss use it and farm more ads