
Unsubscribing from IMAP folders doesn't work
I uncheck folders in "Subscribe", press OK. Then open "Subscribe" again. And those folders are checked again. And this happens only with one mail provider. For other mail providers unsubscribing works.
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Is this with a Yahoo/AOL-type account?
I don't know about mail.ru, but Yahoo accounts have a long-standing bug that doesn't allow unsubscribing:
https://www.reddit.com/r/Thunderbird/comments/v2qyy1/unsubscribing_to_yahoo_folders/
so it's possible the same thing affects mail.ru. You might be able to disable certain IMAP folders in webmail settings, as is possible with e.g. gmail.