The search functionallity is a integral part of nearly every messaging service nowadays.
A way to search through the server/chat system chats (idk if server chats are permanent or only temporary) would be really great.
It could be implemented on a per chat basis or in the global search bar. (In my opinion it would be best to have both.)
Also the search bar should be opened by pressing strg/cmd + f even if you don’t implement the search functionality.