You can’t, it’s no longer end-to-end encrypted. The way proponents say it works is by “client-side scanning”, i.e. an app scans messages before they are encrypted. Of course, that just redefines one of the ends of “end-to-end encryption” - instead of you, the scanner is now one of the ends.

So previously, one end of a message trajectory’s is where you type it, it then gets encrypted and sent to the receiving party (the other end), who can decrypt and read it. After Chat Control, you type it, it then goes to the scanner, which scans it and potentially notifies a third party of the content, and then afterwards it gets encrypted and sent to the receiver, who can then decrypt it.

Yes, calling that end-to-end encryption is indeed a perversion of the term.