Make a search button available in personal chats and groupchats to be able to search for words in the persistent history. Currently you have to scroll up for old chat history but you don't have a way to search for specific words or phrases in the history. Persistent chat should also be used to save information that you can search for later on.
For example i know that 2 month ago i discussed a specific ticket with my team in our groupchat and i want to find out what the discussion was about. Currently i have to scroll up and check every log and am not able to pinpoint the information.
With a search function i could input the ticket id (for example) and sametime could show me when this string was written in the chat. With a click i should be able to jump to that point in the conversation history.