How do I set a separation of replies in sent-folder?

Dear all,
I have a problem. Whenever I delete an incoming mail the relpies of this mail will be also deleted although I set the option to save a copy of sent messages to “Sent” folder” - see Screenshot.
I´d like to delete incoming mails in the inbox without deleting the replies in the sent folder. Is there any option somewhere?
Thanks in advance for your answer.

Disable (Conversation view) in “Menu / Settings / Mail / Read”. Then click “Apply” and “Ok”.

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