How to delete a user folder in Yandex.Mail without losing messages?

Question

Yandex

I created a rule in Yandex.mail, according to which letters from certain senders are added to separate created folders. By applying these rules to the existing archive, we moved the letters through the folders. It turned out that the mail programs used do not pick up these letters via IMAP. Accordingly, you need to return everything back, i.e. put all letters back in the inbox and delete the folders. But here there are doubts. Firstly, Yandex does not have the possibility of group work with thousands of letters - it will take several days to move them page by page. Secondly, there is no understanding (and it is not written anywhere) what happens when a folder is deleted - are all letters deleted with it or are they moved a level higher?

Answer 1

And, that's it, I found the opportunity to mark all letters in a folder in the web interface. It appears in a popup.