How to switch camera on Nextcloud Talk android app

I am using the Nextcloud android app installed from F-Droid. This is version 7.0.8.

I am unable to find a way to switch the camera used to send video. It always use the from camera (the one facing me).

Is it possible to switch the used camera during a call? If yes, how?

I am almost sure that I was able to that with a previous version. Am I wrong?