Warning against not supporting the latest player safety features on menu.

When I logged into my MC I noticed the warning. I read it and clicked don't show again then clicked play assuming sense I already read it the rest would go away. But every time I log in it still pops up. I can't get rid of the pop up or symbols and its starting to bother me. Can you please tell me what to do or fix it please? It only affects modded/ versions UNDER 1.16.4 Thank you!