deactivation of uniting of emails

Hello, Can you advise me if it is possible to deactivate function of uniting of emails from one sender?(and receiver). I do not like that if I want to read older messages and download attachments they are not listed one after the other as I used but I must looking under head of the last message-it is much more steps!

Menu > Tools > Settings > Mail
Under “Conversations” select “Disable conversations”