The app records all calls by default, but you can enable manual recording. To do that, go to Settings > Recording > Exceptions and create an exception by call type for outgoing and incoming calls with an action "Never record".

If you need a more precise control, use "Exceptions" menu to add specific phone numbers, contacts or contact groups that will be treated differently. Along with “Record always” or “Record never,” you may select “Add star.” Starred recordings will survive automatic cleanup if it's configured (note that you still have to enable them with your settings). You can use this feature to ensure that no important recordings (e.g., with your boss) will be removed in cleanups.