Please tap on the “tempo display” in the top menu to open the “Tempo” pop-up, which also includes the “Recording Mode” options.
As of yet, audio recordings will be placed on top of each other and remain hearable (similar top a looper).
The behaviour is planned to be updated in the future.
The Cubasis reset feature (located in the setup), allows to relaunch the app with an empty project in the case of unexpected issues.