It is not uncommon to want to search for older conversation content. To search the message history in a room (or in all rooms) for a certain text, you will find the text, you can find the "Search" button in the upper right corner of the Element app. "Search" button.
Searching for messages is possible in unencrypted rooms without any problem, since Element
has access to all messages. The situation is different in encrypted rooms. This function
is only possible using the desktop client (see Clients / Installation), because the messages must be cached for the search. The message search
must be explicitly enabled under
Security & Privacy ->
Afterwards, searching is also possible in encrypted rooms.