Yes I am talking about the help text in echo area. In newer versions apparently they only show a single line by truncating the eldoc-doc-buffer content(not super sure on this but they do truncate to 1 line). eldoc-echo-area-use-multiline-p does not work for that sadly.
Apparently this was changed only recently. I am surprised not many people know/talk about this change. Still looking for a fix.
Edit: I do agree it is annoying but for unknown codebases it helped me a lot.
I also like to view entire doc even jumping. I created some Eglot additions here https://github.com/cxa/eaglet which have an option to enable this behavior if it would help.
Apparently this was changed only recently. I am surprised not many people know/talk about this change. Still looking for a fix.
Edit: I do agree it is annoying but for unknown codebases it helped me a lot.