Removing old iPhone 12 from Apple Account on new iPhone 17

I purchased a new iphone 17 and traded my iphone 12 at apple store. All works well but when I go into my Apple Acc on iphone - my old iphone 12 is still showing up plus my iphone 17 and imac.

when I press side arrow it says _ "remove from account" -

will this affect my current iphone 17 account ? or should i just leave it there?

thanks

[Re-Titled by Moderator]

Original Title: iphone17