Conversations 2.15 reorganizes the settings into different categories. This gets rid of the old 'Expert Settings' which hid a lot of useful settings.

One nice setting that was previously hidden away in the expert settings is 'Direct Search'. This gives you direct access to the search field in the 'New Chat' screen. If you want to start a new chat with someone you only have to type enough characters to make the search result unique and then press enter.