uchenick,
I am guessing . . .
Assuming that you consulted:
"https://support.brave.com/hc/en-us/articles/360023851591-How-do-I-view-DRM-protected-content-
And you have by now Disabled Widevine:
Then you are saying (?) that you see the Widevine extension here:
but you cannot remove it (no control in that window - or controls are not effective)?
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You might find the extension here (I use Default (Profile 1)):
/Users/your_user_shortname/Library/Application Support/BraveSoftware/Brave-Browser/Default/Extensions/[Widevine-something-here]
There might be, as the extension, a folder named “WidevineCdm”
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There might be a Preference file, too:
/Users/your_user_shortname/Library/Preferences/[perhaps com.widevine.something or chrome in the name ?]
Before removing manually, Quit Brave Browser.
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Probably a good idea, to not delete the items, but create a new, temporary folder on your Mac Desktop, and move the items to that folder. Then Quit everything and Restart your Mac M1.
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You might want to consider:
There is a lot of info re a Widevine installation and nuance of the extension status (settings) affecting the presence of the Widevine folder . . . throughout that page – worth study and making notes.