Lol, no.
So thunderbird have 2 search bars, one on top, other in directory itself. The top one does what I'd expect browser search bar do, opens new tab and search everywhere, the bottom, again, inside a directory listing, I expect to search within directory.
If you type text, it does that, filtering messages in current view
If you type text and press enter, it does exact same thing the top one does, searchs everywhere, instead of the fucking directory I explicitly clicked and navigated to the other search bar
But fine, that's a quirk, you can get used to it... if not for how bad the opened search window is.
You get a list of messages where there is just enough text to not know whether you care about content of the message and whole thing fits like 4 mails (I get hundreds a day from various system stuff of hundreds of servers) and the ENTIRE RIGHT SIDE is empty and unused, and as it defaults to showing all mail, not mail in directory I was in, it's mostly useless. It also only shows last part of the path, not the whole dir mail is so instead of / dir you just get B
BUT WAIT THERE IS MORE. THEY MADE BETTER VIEW!
Just click on "Show results as list". Its just a list with a browser, same you get with normal directory browsing. It still wasted space, but it's at least usable
Let me just use the search to narrow down the list.... oh, it for some reason stopped searching in message bodies despise "body" option being selected and the same setting working in "main" directory search... and guess what enter does ? Of course, contrary to all good UI/UX design, it will run another tab with search that forgot your original query so when you might think you could narrow it down, nope